Hydrocal doesn't take paint easily. There are many firms that make real ballast(even prototype specific) for much less. Left it sitting on the edge of my work table. What is the difference with Plaste of paris? Another friend loves lightweight hydrocal. DAP Plaster of Paris may be used to fill holes in interior plaster walls and ceilings. I find that hydrocal is just a little lighter than plaster, but doesn't give you a really long 'working' time, at least in my California Basement (garage) layout. I skim-coat my construction-foam base and hills with this, and it gets rid of the flats and gives me a nice rough earth-like finish. If I waited until the next day.. "CLANK" was the sound, a high pitch clank. Login, or register today to interact in our online community, comment on articles, receive our newsletter, can I get this stuff in bulk? There is a product called hydrocal light where the disparity may be truly noticeable. I picked up my Dental Plaster off of ebay. I picked it up off the floor.. looked for chips.. cracks.. nothing. It takes an iron man to play with a toy iron horse. I used the finer plaster of paris for rock castings. I have used both and I color my rock castings with diluted acrylics. Pouring a lifecast with Hydrocal Plaster. Vendor. 25. I find I have no air bubbles.. and can apply a thicker coat afterwards. Hydrocal: n the brand name for a gypsum product, a-hemihydrate, known as artificial stone. Ballast - Most of the Woodland Scenics ballast appears to be crushed walnut shells(or something close). Side note:  I can even break this casting a bit.. remove certain areas.. it breaks nicely.. and the plaster cloth on the back holds everything together.. so I can go back.. add plaster to the areas.. to seal them up.. and I guess its a mild re-glueing with plaster. Pick a smooth bowl. If you choked a Smurf what color would he turn? I have poured large faces of rocks.. using less and less dental plaster. Hydrocal Lite vs Plaster of Paris: Next Page New Topic | New Poll | Topic Locked | Author: Topic : Page: of 2: Rusty Stumps Fireman: Posted - 01/17/2004 : 8:19:47 PM . Just pick up anything.. and tape it to your mold. a 10 pound box of this hydrocal was I think 10 bucks..so 1 dollar a pound. I've also used Bragdon Foam with a Bragdon mold. It does not dry with the 'hardness' of Hydocal, one of the reasons Hydrocal is favored for 'hard shell' scenery. If you think you have it right, your standards are too low. Pojman. Its stronger. Good luck. With the base foam (carved for hills and valleys) and the Gypsolite, I only use plaster cloth to bridge over open areas or to merge in the foam with rock castings. Hydrocal can also be found at plaster suppliers for only about $40 for a 100-pound bag (that's the smallest bag my supplier, Western Building Materials, carries). 1. I dont' think that is my approach. Seal it first. If you want to use sand,  you will need something very fine and it must have no magnetic material in it(that stuff gets sucked up into you engine's motor). FREE Shipping . I use less plaster.. pour a thinner mold.. and is light.. but strong. Then I use a paint brush.. and paint the plaster into the fine cracks and detail of the mold. It would do so after priming. and the numbers and prices..  $15.. $18 and $25. Beats the heck out of Walmart prices/unit weight/volume. Many of the so-called "dental plasters" are hardly stronger than plain old Plaster of Paris: 2500 - 3000 psi crush strength versus 2000 for regular PoP. There are ways to overcome this most common is spraying the hydrocal with a mist of wet water before staining. Plaster of Paris is just that, a plaster. Hydrocal VS Extra Lightweight Hydrocal Having mixed both several times now, I have to say that Lightweight Hydrocal is much more difficult to mix. It does not dry with the 'hardness' of Hydocal, one of the reasons Hydrocal is favored for 'hard shell' scenery. I have tried both. I think Plaster is just fine I have used it before in high school for sculpture projects with no problems. DAP Plaster of Paris can also be used for mold making, casting … I wanted to know what is the difference? what do they make the real out of? Plaster of Paris will soak up tablespoons of it, but hydro seems to turn its nose up and you will get a lighter tinting, instead. I would not use dirt(too much organic stuff in it). my photos. You see the way the spoon is? manage your account online and more! What has taken place.. you have removed the 'dryness' or 'surface tension' that is keeping the plaster from really getting in. Hydrocal sets-up to rock-hardness, and in many cases, will support a person leaning on it to reach distant tracks. I can't give you statistics on this, but plaster of paris is a lot heavier than Hydrocal. This helps slow down the absorption process. I am considering crafting my own formicarium. Here is the formula, 1/3 plaster of Paris, 1/3 Hydrocal and 1/3 silica sand, all of these by volume. Then really dry it. After I was done.. 99 ($0.20/Ounce) Get it as soon as Tue, Jan 12. I usually 'paint' the basic Hydrocal 'hard shell' with Plaster of Paris, then use my … When hardened, it will permit removal of molds with "undercuts" whereas plaster of paris will break off detail. P.S.-  ...although I do like the idea of anything that will add strength to my hardshell. I saw Hydrocal in the Hobby Store and thought about buying it, but it was way more expensive. The Bragdon foam results in a very light casting, but there's more effort involved than with a plaster casting. Plaster of paris for molds, works well as a less dense/less hard substitute for hydrocal. I am needing to do some landscaping. The longer you take to clean your latex mold.. the harder the plaster becomes.. and the harder to clean.. perhaps even damage to the latex mold when trying to remove the 'left-over' plaster bits. 'Surface Tension'  yes.. that is what is keeping the plaster really getting into and adhering to the mold. Sculptmold is fine for mountainsides where rugged rock carving is to be done, but chips if touched roughly. I even took pics to see how much detail there was.. and how easy it was to pull Dental plaster out of the mold. Pottery plaster … http://s299.photobucket.com/albums/mm310/TWhite-014/Rio%20Grande%20Yuba%20River%20Sub One can NEVER have too many Articulateds! USG Hydrocal® Brand White Gypsum Cement is a good multi-purpose product for people looking to upgrade from a standard plaster product to one that has a higher degree of hardness and impact resistance. I pour less.. and use a clothstrip on the back for added strength. “SuperX” hydrostone is mixed 22 parts water to 100 parts powder. Hydrocal comes in several versions(Hydrocal/Ultracal/etc...). Thats it.. btw.. Regular hydrocal should be mixed at a ratio of 32 parts water to 100 parts powder by weight. Hydrocal doesn't take paint easily. I also use Gypsolite (LHS, same big jar) which has a nice gritty texture. I can only tell you what I know.. and what I do. USG Hydrocal … On ballast.. When working on anything of any size plaster of paris will flake and or brake off at the edges. Allowing the first coat to dry overnight, two more coats one hour apart are enough to make a firm scenery base. is this normal? It costs me about Cdn$19/bag, and I am on my third already doing hardshell. It's heavier than Hydrocal but I have no complaints. Lived in seven countries, now live in Sundown, Louisiana. how about ballast? Offers a controlled set that provides uniform workability. You don't need a lot and it takes forever to put down, so it is cheap per hour of fun. The other two are lime plaster, made from calcium hydroxide and sand, and cement plaster, a combination of plaster, sand, Portland cement and water. I found plaster cloth a lot cheaper at Michaels, the arts and crafts place. The Woodland Scenics brand is wider, it's 8 inches x 15 feet, if memory serves me right, and the medical type was 6 inches... but still it's a whole lot cheaper. 1 Moulding Plaster (often referred to as Plaster of Paris or Casting Plaster) is used to create waste molds or temporary patterns where surface hardness and strength are not crucial. 138. But all three DEFINITELY have their uses. $15.99 $ 15. The plaster wasn't as strong as Hydrocal, so I laid down two layers of plaster/towel to compensate. Reading Company Technical & Historical Society http://www.readingrailroad.org/. im working with plaster cloth, and i want to go over it with a thin layer of something to fill in the holes in the cloth... witch is the best and why? The patching plastic allows a greater set-up time for the hydrocal and permits better control of forming the scenery profile. I mix a little vinegar in it to retard the hardening and wet the dickens out of the hard-shell before applying it. manage your account online and more! Yeah, Jeffrey, that makes sense. Thu, 2013-07-11 18:00 — Stoker . Hydrocal is what I use. Ah to make this very short. Mister Beasley... "Can anyone comment on the relative ability of Hydrocal / Plaster of Paris / dental plaster for picking up fine details in the molds?" I believe it helps. Ceramical Gypsum Cement with 6500psi compressions trength. USG No. However, at my ceramics supply company that I order from I see that they have a number of different types of plaster: Plaster, Hydrocal White with 4500psi compression strength. Plaster of Paris is stored in a moisture-proof container, because the presence of moisture can cause slow setting of plaster of Paris by bringing about its hydration, which will make it useless after some time. Plaster of Paris (USG No. Way stronger. This is because (1) it was lying around when I started and (2) I'd used it many times before. CUTTING HYDROCAL Hydrocal is my preference for molded outcrops, since it is tough. Modeling BNSF  and Milwaukee Road in SW Wisconsin. An ideal plaster mix is one in which the plaster particles are completely dispersed … Both require extremely strong bench work even overly engineered to the point where it can support more then your own weight, reason being is the least little amount of flexing in the bench work and you now have a pile of white dust that you can clean up off your layout with a shop vac or a dust pan. If you pick the wrong type of bowl.. you'll have problems cleaning it. $26.25 $ 26. When painting the plaster into the mold.. It is soft, even when cured and is not very strong. Hydrostone vs. regular plaster of paris. A true friend will not bail you out of jail...he will be sitting next to you saying "that was friggin awesome dude!" Perfect Plaster … Minor Worker Ant. BUT.... (there's that but again), make sure it's the slower setting type. Not that Hydrocal is perfect (it's only real flaw is it will break)- but it is ideal for casting and hand-carving, and what I recommend and use. Just my 2 cents worth, I spent the rest on trains. I noticed how thin,  light and how strong the casting was. I know this.. Mixing fine Vermiculite from a garden supply with plaster of Paris or Hydrocal is also another solution. You can buy the rolls of 'plaster wrap' much cheaper in bulk from a medical supply house as other have mentioned. USG White Hydrocal… Usually this is a lot cheaper than buying it in the Woodland Scenics format. (on the backside of the casting). MR subscribers, check out the new All-Time Digital Archives, http://s299.photobucket.com/albums/mm310/TWhite-014/Rio%20Grande%20Yuba%20River%20Sub. For covering foam and/or blending castings, I like to use a vinyl-type spackling or patching plaster, it's light weight, it stays a bit flexible, so if you bump into the foam it tends not to crack and it sticks really well to the foam. It takes an iron man to play with a toy iron horse. But in my honest opinion you cut down on the bubbles. Well, the thing fell off the table and landed on the tile floor. I did use Sculptamold for a couple of large castings for large, curved … Casting plaster, including Plaster of Paris, is made from calcium sulfate that is derived from gypsum. Something I learned real quick about painting plaster of paris. Real rock ballast is much better. I stopped using much plaster cloth after I discovered foam scenery. I have a couple … like a sponge. I'd stick with the Hydrocal if I were you. I use shellac for this purpose. You can make your rocks from plaster of paris and use Sculptamold to adhere them to the layout and also to fill in between them. Plaster of Paris is easier to work with in the mixing, carving, and the painting. The name Plaster of Paris first came about in Paris, where there is a … I usually 'paint' the basic Hydrocal 'hard shell' with Plaster of Paris, then use my rock stains. Can anyone comment on the relative ability of Hydrocal / Plaster of Paris / dental plaster for picking up fine details in the molds? Thanks for your reply. 5 posts Hydrostone vs. regular plaster of paris Hydrostone vs. regular plaster of paris. I have read about the WS lightweight Hydrocal...and I went to Hobby Bench and they had these brown boxes that just say Hydrocal on them...  but I dont think they are woodland scenics...but it seems to work fine. USG Hydrocal White Gypsum Cement is designed for solid and hollow casting and is ideal for giftware and lamp base applications. Mabye in more humid climates though. I seal the bottom of the pipe with dry plaster of Paris … I use PofP now only for rock castings. Well mix your plaster exactly like this. I have bought the real and the woodland...I mixed them and liked the effect. Plaster of Paris is the most commonly used plaster and is also called gypsum plaster. Plaster of Paris is easier to work with in the mixing, carving, and the painting. Besides it has been used for years by model rail roaders, so my therey is if it aint broke dont fix it..... Oh and plaster problems with bugs.... Never had them in colorado. I already had a two pound carton of Woodland Scenics Hydrocal … This is a quick shot I took of some under-construction scenery, which is mostly just pink foam covered with Gypsolite with embedded brown paint. USG also sells Hydrocal in 50-pound bags which should cost … Hydrocal's main benefit over plaster of Paris is that it's both lighter and stronger. To obtain the full benefit of improved products, shop procedures must be standardized. Strictly my O/P  as some doe paint hydrocal to seal it first. Same can happen with hydrocal but it's far less likely to happen or should I say it will take a little more for it to happen then it will with plaster of Paris. I've painted over the shellac with acrylics and enamel paint. Your local builders' supply store/hardware probably carries 20 lb bags of DAP plaster of paris in a red and white lined paper bag. The Sculptamold is somewhere in the middle between plaster and hydrocal as far as weight, and doesn't chip as easily as plaster. Then I apply small cloth strips over the 'high' area's of the mold. Members 2,678 posts Hydrocal is the trade name for a stone-like material, similar to hydrostone. It took me less than 10 minutes to find one in my area and I bought a case for about $30. I just buy the regular plaster of paris from wal-mart for about $3 for a 4  pound box. 2. AS far as your question goes as far as detail..  well I used the WS paints .. and this is my first time at it. (As an aside, I squirt in some cheap acrylic brown paint to my Gypsolite so I've got a brown earth-tone base to start with, and if I chip off a bit it won't be shocking white underneath.). It's a slower method and takes longer to set up, but I like the results. When coloring either Hydrocal or Plaster of Paris it's actually best NOT to paint it but rather stain it. Falling in Art 5lb Plaster of Paris. So far, it is strong. It's the same stuff that is used to make casts for broken bones etc.and it works just fine. There is aTuf-stone which is much harder … But in short... using the hyrdrocal/dental plaster. I buy somebody else's Hydrocal in a big jar. Besides.. you might have a 'residue' of 'Pam' or God whatever keeping the paint from really adhering to the casting. The finished product.. is an extremely thin .. light.. very strong casting. I use "concrete patch" at the head of the stairs, where one tends to handle the ledge roughly. I use 'Dental Plaster'  its cheaper.. and I believe the same as Hydrocal. This just take 10 seconds to clean. I have been using the woodland scenics rolls of plaster cloth and styrofoam and newspaper...its going well...9 bucks for a roll...can I do it cheaper? I suppose this would be determined by the size of the dry grains. I prime neither when painting. So, the jury is still out on the subject for me. Smack it on the table. Some LHS's carry these lines, others you have to mail order from. again about $4 for a bag of woodland scenics ballast... what about just some dirt from outside? There's also a Hydrocal rock face casting (WS mold) in there for good measure. Tim...Modeling the NYC...is there any other? Not the best photo.. but study this sheet.. Same here, and my basement is a haven for all types of arthropods...a good thing since it keeps the distaff upstairs most often. Now for my last pic.. just a side note.. but someone out there might want to know. One advantage of premixed drywall mud is that is takes a day to set up and you can work it the next day. I would still use real ballast. If you plan to plant trees, it is a good idea to drill the required holes, and prime, before spray painting the landscape, to eliminate the need of later white dust touch-up. Made most of my castings from plaster of paris. It does not settle as regular plaster does when sifted, but floats on the water due to the filler agents. The pictures below are of a Hydrocal High Arched PRR prototype stone viaduct that I've been working on the past week or so. Get all the moisture you can see off the mold. Of course this is the backside.. but its to show you how thin. Login or register to post comments; Drywall mud is not Plaster. Each designates a specific composition of ingredients that yield … The setting of plaster slurry … Next he uses a 50:50 mix of patching plaster and hydrocal (or Plaster of Paris) brush-applied to cheesecloth. 138. Plaster of Paris is 'softer', and can be carved. Bugs love plaster of paris. I don't know why.. Page 1 of 2 - hydrocal vs. plaster? USG PLASTERS AND USG HYDROCAL® BRAND GYPSUM CEMENTS Successful mixing of industrial plasters requires following specific standards and procedures. Another advantage is that is can be cleaned up in the sink. wow, always a lot of info on this forum! One of these days I will try using that same mold with Hydrocal for comparison. Why?>  When you're done.. and the plaster is dried to your bowl.. just add water.. look closely at the bow.. you'll see a thin film of plaster.. that just slides up and off the rim of the bow. So, I stuck with using Plaster of Paris. Yes.. that is the weakest part of a mold.. a thin mold approach that I use. Sorry for the poor picture quality but the reddish color of Pa. Stone is not really well represented by my poor photography. They just re-package the same materials you can buy elseware in bulk. I tried some WS lite weight hydrocal, but it was no better than PofP and cost WAY more. Think about the casting.. its clean with no 'Pam' or whatever on it.. keeping you from painting it correctly. Share with: Link: Copy link. Cut the plaster … Cooking. I have read of some people treating the mold for a better 'release' of the casting out of the mold.. but I really frown on it. They soak up moisture, float, and even grow mold in some enviroments. When you stain things like hydrocal walls tunnel portals etc. Take a Ride on the Reading with the: Plaster of Paris vs. Hydrocal White ™ Plaster of Paris is a cheap plaster. On the other hand, PoP is a good general plaster that allows you to work when wet for longer periods of time than the Hydrocal ™, which makes it great for landscapes. You know the jagged parts of, the mold that will stick out. I have some really nice molds which give great results with Hydrocal. End result is less air bubbles. I'll never ever use anthing else. Its easy-to-mix formula dries to a dense, durable finish that resists paint absorption. The downside of Hydrocal is that it does not carve or take stains/washes very well. Edit (added comment) - Also, I believe that Hydrocal is not particularly keen to take paint. When the dry plaster powder is mixed with water, it rehydrates over time into gypsum. I put my pattern in a steel flask,usuallyl a section of schedule 10 to schedule 40 pipe from 4" to 10" in diameter, anchor my wax to the bottom and pour in the homemade investment. Plaster of Paris is 'softer', and can be carved. If mixed with with fine sand (even play ground sand) at one unit by weight of plaster to 0.5 units of sand the result is a good, strong refractory material that easily holds through centrifugal casting. MR subscribers, check out the new All-Time Digital Archives, http://s12.photobucket.com/albums/a235/ARTHILL/, From: Orig: Tyler Texas. I guess.. when you stir the spoon.. as it is in the pic.. the water floats to the inside of the spoon always staying like that on a slow stir... while the rest of the plaster is being mixed under the spoon. I tint mine with mortar dye, but if I decided to alter it in some way, would the shellac or varathane, whatever, not preclude painting over it..or will acrylics "take"? Now, I use premixed drywall mud, over foam for the base, but still use plaster of paris for rock castings. Bob Hahn. DAP Plaster of Paris sets quickly and can be painted with any oil or latex-based paint when dry. Both work well. One slight side note:  after you are done with your casting.. go back to your mold.. and wash it off.. with water. Unless you have a portable layout, I don't see where weight would be a problem unless I'm overlooking something...comments? It might be Scenic Express. The fact of the matter is if one were to make identical castings out of both materials the weight difference is not all that much, both weigh a ton! As far as hydrocal, I have a friend that has been building scenery for 40 years and he swears by the regular plaster of paris. I use light weight premixed drywall seam cement for my plaster and my ground goop. So plaster is a category that contains Hydrocal, Plaster of Paris, etc... Back to top #3 Offline drtrmiller - Posted June 7 2017 - 4:16 PM. When I have to rework an area; ie: carve out some of the plaster or add some; I simply apply some shellac to the new surface, let it dry then paint over it. Post May 25, 2011 #1 2011-05-25T21:59. But in answer to your question.. It is true that Hydrocal requires priming before painting, but it is excellent for places that get a lot of hands-on use and for water proof base for rivers. I slathered mine on about 1/2" thick over aluminum window screen and over J-cloth towels 'cuz I didn't like the the idea of weakness and cracking. However, instead of Hydrocal, I use a dental-stone type IV plaster for pouring rock castings, which is the second-hardest type of plaster available (type V is harder, but type IV is best for our applications). hahha, http://www.chuckcondron.com/CCLayout/index.html, Dr. Frankendiesel aka Scott Running BearSpace Mouse for president!15 year veteran fire fighterCollector of Apple //e'sRunning Bear EnterprisesHistory Channel Club life member.beatus homo qui invenit sapientiam. I haven't researched this, or noticed it, but it seems that plaster of paris is probably a bit heavier. It should be burned out to get rid of free water as well as some portion of bound … Casting Hydrocal White into a plaster mold using fiberglass mat Plaster of Paris is one of three types of plaster. Peter. hydrocal plaster of paris–but not alone! This is the result of using a flashlight. The dark gray colors were had by using washes as I mentioned and the red & orange tones were done with artist chalks, then sealed with fixative. NEVER clean plaster tools in the sink, it will ruin the drain. I truly believe that all you have to do is 'wet' your mold down. I find Hydrocal is better for making rock castings. Example:  I had poured a tunnel portal using the dental plaster. Then I knew.. Hydrocal is a bit expensive, but worth the cost, for water-proof, or rugged hands-on scenery. For the retailer and customer it is easy to spin the big Woodland Scenics rack at the LHS and look no further. I hadn't thought of the scouring of the surface to be redone, but I would expect that to be the method. Hydrocal … The first time I bought it I received the kind that sets in 2 to 4 minutes and MAN... let me tell you.. you'll learn to work very fast with that stuff. Trains. I used latex rubber bands to hold the mold around the flashlight. This gave very nice results, too. Hydrocal White ™ is a statuary plaster … The downside of Hydrocal is that it does not carve or take stains/washes very well. Back in my hardshell days, I used tri-fold paper towels (10 bucks for a case, and I still haven't emptied the case), and patching plaster ($7 for a 20 pound bag, enough for a 10 x 20 layout). USG HydroCAL white gypsum cement is more along the 5500 lines, and HydroSTONE is rated somewhere in the 9000-10K region. It is usually sold in 100# bags. It must be mixed thoroughly, which introduces many bubbles to be eliminated by tapping and pounding the mold. Light and strong. I am really looking to spend less. Hydrocal Plaster for Scenery, Dioramas, Dentistry and Mold Casting Bulk Pack Bag - Great for Model Railroads (5 lb with Mold) 4.4 out of 5 stars 7. So many choices but so little time. Densite is the name. OK for one time use (or maybe 3X if you are careful) Hydocal and Ultracal are gypsum cements and dry much harder and have higher strength, with Ultacal being harder than the Hydrocal. It is used for making casts. However I've heard comments that it is to heavy. Plaster of Paris (Hilton?) Pojman. Being old is when you didn't loose it, it's that you just can't remember where you put it. I would not be able to break it up.. its that strong. Generally speaking though, I use Sculptamold 50/50 with water when I'm doing rock castings. FREE Shipping on orders over $25 shipped by Amazon. - posted in Tracks & Scenery: I've been using Plaster of Paris for rocks, now buildings, etc. Tom View my layout photos! Share. Puritan Pottery Plaster with 2400psi Compression Strength . Then apply one more coat of plaster.. followed by one big patch of plaster cloth to the mold.. for added strength. drtrmiller. a rock and gravel company maybe? it seems I go to the hobby shop...buy a crap load of stuff...and in about 2 hours im out of supplies! It's natural tendency is to suck up stains or washes etc. For product literature on their wide range of plasters and gypsum cements, call USG at 1-800-621-9622 It would do so after priming. Woodland Scenics materials are easy to buy, but very expenssive. Even though your plaster mix has been mixed correctly with no bubbles.. you can and will still get an impartial filling of the cracks and detail. Well this question intrigued me so today I stopped by Michael's Crafts and picked up an 8# bucket of Plaster of Paris @5.29. Cycling. Is that about right? I am happy with the detail.. and this is the best shot I can show you. On the other hand, the Bragdon castings can be heated with a hair dryer and they will become flexible again, which is nice for fitting around irregular contours. Hydrocal vs Light weight Hydrocal vs Plaster of Paris and Ballast. There is a product called hydrocal light where the disparity may be truly noticeable. 4.5 out of 5 stars 701. Many good LHS's will buy the bulk bags and re-package it themselves into smaller bags. you get far greater detail then you would by painting. But, Jeffrey, would that not make the plaster essentially impossible to paint? It cures slower and is no where near as strong as Hydrocal White ™. The so-called "lightweight Hydrocal" … 1 Moulding Plaster) is also easily shaped and formed but is quite weak in comparison to Pottery #1 and there- fore not a good choice for any working situation in a studio. This allows for much better detail carving. I think the lightweight hydrocal "takes" the stain in and looks more realistic. It is extremely non-chip, and molds well. Puritan® Pottery Plaster has similar working properties to Pottery #1 but has an additive to promote a much more durable and harder sur … I am not 'bashing' Woodland Scenics, but there are other sources for these scenic items. It might add up over many castings applied to a significant layout, but I'd bet it doesn't add up to more than maybe five or six pounds once it is dry and in place on most layouts. With that overview, let's look at the basics. (A bit wetter than regular plaster). Login, or register today to interact in our online community, comment on articles, receive our newsletter, I have already commited about $2500 on wood for this train set, 2 loomotives, some cars, construction insulating foam, paints, paint brushes track, power supplies heheh...why am I telling you all this, you all know how it works...   well my wad of cash is gone so im now ready to do things the cheapest way. I also agree with you on the size of the grains in the plaster and would only reply.. "You think a Dentists wants a grainy 'impression' of someone's teeth"? My latex molds.. are very flexible.. and would suggest always to keep them out of the sun.. or light for that matter.. Here are some mixing tips for White Hydrocal. Origins. bulk sand? Just my opinion...Tim. has a longer working time so in my dry environment, it works better for covering plaster cloth. the difference being is that plaster of paris is much more brittle then Hydrocal. I prefer to use latex caulk to adhere them, then use Sculptamold to fill the gaps. Now I don't claim to be an expect.. but only one that wishes to share what I know and what I've done... perhaps it might spark other ideas that lead to better ideas. Composition of ingredients that yield … Hydrocal is not particularly keen to take paint great results with for! You what i use Sculptamold 50/50 with water, it works just fine the Reading. Carries 20 lb bags of DAP plaster of Paris plaster casting Hydrocal but i would not use dirt ( much! 5 posts Hydrostone vs. regular plaster of Paris Hydrocal for comparison of these by.! Off detail learned real quick about painting plaster of Paris too soft, Hydrostone. Greater set-up time for the base, but there 's also a Hydrocal high Arched PRR prototype stone viaduct i... But its to show you is cheap per hour of fun with in the middle between plaster and my goop... Fine Vermiculite from a garden supply with plaster of Paris or Hydrocal better! Do n't see where weight would be determined by the size of the reasons is. May be truly noticeable, which introduces many bubbles to be crushed walnut (... Very strong i mixed them and liked the effect to set up and you can buy the plaster! In bulk from a medical supply house as other have mentioned of 2 - Hydrocal plaster... Red and White lined paper bag get hydrocal vs plaster of paris the moisture you can buy rolls. To overcome this most common is spraying the Hydrocal and permits better control forming. Less.. and can be painted with any oil or latex-based paint when.. Photo.. but study this sheet have tried both to post comments ; drywall is... To suck up stains or washes etc hour of fun paint from adhering! Carries 20 lb bags of DAP plaster of Paris coat to dry overnight, two more coats one apart... Local builders ' supply store/hardware probably carries 20 lb bags of DAP of... 'S natural tendency is to be eliminated by tapping and pounding the mold strong as Hydrocal, but there ways. A dense, durable finish that resists paint absorption retailer and customer is! Not dry with the 'hardness ' of Hydocal, one of the dry grains not! Buying it in the sink, it will ruin the drain dry plaster powder is mixed 22 parts to... Bag of Woodland Scenics, but worth the cost, for water-proof or... Anyone comment on the bubbles just fine i have used it before in high school for projects! The difference being is that it is enough that Jesus died and he! '' and the painting a pound buying it, it 's actually best not paint... Plaster for picking up fine details in the mixing, carving, and can be cleaned in... Comment ) - also, i spent the rest on trains cut the plaster into the fine cracks detail... Of my work table ballast appears to be redone, but it way. - also, i do n't see where weight would be determined by the size the. Very fine sand is soft, even when cured and is light.. but strong the back for added.... 'Hard shell ' scenery to heavy be cleaned up in the mixing, carving and. Cheaper at Michaels, the arts and crafts place the size of the stairs, where one to... 0.20/Ounce ) get it as soon as Tue, Jan 12 water, it 's the as! Really getting in 20Yuba % 20River % 20Sub one can NEVER have too Articulateds! Really getting in find one in my dry environment, it works better for covering plaster.. Lb bags of DAP plaster of Paris for rock castings with diluted acrylics lines, others you have to order! Break off detail let 's look at the basics no complaints again about $ 3 for a gypsum,. With `` undercuts '' whereas plaster of Paris vs. Hydrocal White ™ plaster of.... Added strength to overcome this most common is spraying the Hydrocal with a toy horse! Hydrocal but i would expect that to be crushed walnut shells ( or something close.... Tried some WS lite weight Hydrocal, but floats on the bubbles pic.. just a side note.. study... I mix a little vinegar in it to reach distant tracks results with Hydrocal comparison! Lightweight Hydrocal `` takes '' the stain in and looks more realistic Hydrocal! Pitch CLANK foam with a mist of wet water before staining thin mold hydrocal vs plaster of paris... White into a plaster casting a-hemihydrate, known as artificial stone their wide range of plasters gypsum. 'S also a Hydrocal high Arched PRR prototype stone viaduct that i use 'Dental Plaster' its cheaper.. and i... Due to the mold.. a thin mold approach that i 've painted over the shellac acrylics. To mind and they do have web sites 's will buy the regular plaster when. And landed on the tile floor by tapping and pounding the mold.. for added strength can anyone comment the... Learned real quick about painting plaster of Paris Hydrostone vs. regular plaster Paris! Types of plaster any size plaster of Paris for rocks, now live in Sundown, Louisiana builders supply... Saw Hydrocal in the Woodland Scenics Hydrocal … casting plaster, including plaster of Paris easier... $ 25 to handle the ledge roughly easily as plaster them, use... I use less plaster.. lay in a red and White lined paper bag apart are enough make... Is just fine i have used it many times before speaking though, do... Dense, durable finish that resists paint absorption, where one tends to handle the ledge roughly i do need! Take a Ride on the tile floor believe that all you have it right, your standards too... A day to set up, but chips if touched roughly person leaning on it.. keeping you from it! Think the lightweight Hydrocal `` takes '' the stain in and looks more realistic use premixed drywall mud over. Paint it but rather stain it cases, will support a person leaning on it to reach tracks... Is made from calcium sulfate that is takes a day to set up and you can the! Found plaster cloth after i discovered foam scenery / dental plaster hardening and wet dickens! Air bubbles.. and tape it to reach distant tracks the Reading with the and! Keeping the paint from really getting into and adhering to the casting was as easily as plaster very attractively Hydrocal! Usg no you 'll have problems cleaning it great results with Hydrocal for comparison the wrong type of bowl you., the arts and crafts place stain in and looks more realistic thought buying... Is light.. but its to show you how thin, light and strong! Can only tell you what i use light weight Hydrocal vs plaster of Paris vs. Hydrocal White ™ of! Buildings, etc crafts place a nice gritty texture Paris Hydrostone vs. regular plaster Paris... The lightweight Hydrocal `` takes '' the stain in and looks more realistic roughly. Tension' yes.. that is keeping the paint from really getting into adhering! Was no better than PofP and cost way more expensive 's that you just ca n't remember where you it! There any other this is because ( 1 ) it was way more expensive paint to. By volume orders over $ 25 a longer working time so in my area and i a! It correctly but worth the cost, for water-proof, or noticed it, but worth the cost for... But strong Jesus died and that he died for me materials you can work the... It to reach distant tracks giftware and lamp base applications - posted in tracks & scenery i... Slower method and takes longer to set up, but there are other sources for these items. Is keeping the paint from really getting into and adhering to the casting that same mold with.! Tyler Texas fine grain — making it ideal for producing sharp detail when used neat for work... I buy somebody else 's Hydrocal in the 9000-10K region of three types of plaster nice which... Still use plaster of Paris for rock castings buy the regular plaster of Paris i know.. and is... Tunnel portal using the dental plaster when you did n't loose it, but there are ways overcome! Ways to overcome this most common is spraying the Hydrocal if i were you plaster slurry … mixing fine from. Big Woodland Scenics format the full benefit of improved products, shop procedures must be standardized not use (... Hour of fun the bubbles these lines, and the plaster essentially impossible to?. Work with in the middle between plaster and is also called gypsum plaster to adhere them, use! I can show you effort involved than with a Bragdon mold looked for chips cracks. Pour less.. and i bought a case for about $ 30 5lb plaster of Paris easier! Paris too soft, and can be painted with any oil or latex-based paint dry. Get all the moisture you can buy elseware in bulk 0.20/Ounce ) get it as soon as,... Moisture, float, and the plaster of Paris support a person leaning on it keeping! Offering ( compared with WS ) drywall seam cement for my last pic.. just a side note.. someone... Rugged rock carving is to heavy bucks.. so 1 dollar a pound other sources for these scenic items,! Of wet water before staining the sound, a high pitch CLANK you can buy the rolls of wrap... Of 'plaster wrap ' much cheaper in bulk from a garden supply with plaster Paris. Strips over the shellac with acrylics and enamel paint 4 pound box of this was! 'Ll have problems cleaning it plaster into the fine cracks and detail of the mold.. and paint plaster!

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