So far, it is strong. the difference being is that plaster of paris is much more brittle then Hydrocal. Is that about right? Vendor. can I get this stuff in bulk? But it is awfully good for rock castings. I truly believe that all you have to do is 'wet' your mold down. Woodland Scenics materials are easy to buy, but very expenssive. (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.). USG No. CUTTING 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. Post May 25, 2011 #1 2011-05-25T21:59. Hydrostone vs. regular plaster of paris. If you pick the wrong type of bowl.. you'll have problems cleaning it. Its easy-to-mix formula dries to a dense, durable finish that resists paint absorption. 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? The downside of Hydrocal is that it does not carve or take stains/washes very well. Many good LHS's will buy the bulk bags and re-package it themselves into smaller bags. Arizona and Great Northern ballast companies are some that come to mind and they do have web sites. Plaster of paris for molds, works well as a less dense/less hard substitute for hydrocal. The pictures below are of a Hydrocal High Arched PRR prototype stone viaduct that I've been working on the past week or so. 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. It is extremely non-chip, and molds well. I picked it up off the floor.. looked for chips.. cracks.. nothing. It's the same stuff that is used to make casts for broken bones etc.and it works just fine. It is usually sold in 100# bags. It would do so after priming. It should be burned out to get rid of free water as well as some portion of bound … Plaster of Paris is 'softer', and can be carved. 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. So, I stuck with using Plaster of Paris. Hydrocal is what I use. Ballast - Most of the Woodland Scenics ballast appears to be crushed walnut shells(or something close). Plaster of Paris is easier to work with in the mixing, carving, and the painting. 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. DAP Plaster of Paris may be used to fill holes in interior plaster walls and ceilings. is this normal? I mix a little vinegar in it to retard the hardening and wet the dickens out of the hard-shell before applying it. One advantage of premixed drywall mud is that is takes a day to set up and you can work it the next day. Pottery plaster … I can only tell you what I know.. and what I do. They just re-package the same materials you can buy elseware in bulk. Good luck. Then I knew.. Same here, and my basement is a haven for all types of arthropods...a good thing since it keeps the distaff upstairs most often. a 10 pound box of this hydrocal was I think 10 bucks..so 1 dollar a pound. 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 saw Hydrocal in the Hobby Store and thought about buying it, but it was way more expensive. For product literature on their wide range of plasters and gypsum cements, call USG at 1-800-621-9622 Lived in seven countries, now live in Sundown, Louisiana. To obtain the full benefit of improved products, shop procedures must be standardized. 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. Just my opinion...Tim. Pick a smooth bowl. I am really looking to spend less. Light and strong. It is used for making casts. Something I learned real quick about painting plaster of paris. Pojman. There is a product called hydrocal light where the disparity may be truly noticeable. 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. But in answer to your question.. I am considering crafting my own formicarium. 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. Otherwise, it will chip very easily. So, the jury is still out on the subject for me. Mabye in more humid climates though. 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! Page 1 of 2 - hydrocal vs. plaster? Login or register to post comments; Drywall mud is not Plaster. With that overview, let's look at the basics. Ceramical Gypsum Cement with 6500psi compressions trength. you get far greater detail then you would by painting. Cut the plaster … Your local builders' supply store/hardware probably carries 20 lb bags of DAP plaster of paris in a red and white lined paper bag. There is aTuf-stone which is much harder … But in my honest opinion you cut down on the bubbles. Just my 2 cents worth, I spent the rest on trains. Both work well. Peter. Sculptmold is fine for mountainsides where rugged rock carving is to be done, but chips if touched roughly. When working on anything of any size plaster of paris will flake and or brake off at the edges. like a sponge. 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. manage your account online and more! If you choked a Smurf what color would he turn? 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. 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. When painting the plaster into the mold.. I seal the bottom of the pipe with dry plaster of Paris … 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. Expect that to be the method takes longer to set up, worth! High school for sculpture projects with no problems with no problems cloth lot... Have no complaints seam cement for my last pic.. just a side note.. but its show! Water before staining in many cases, will support a person leaning on to!... is there any other, but chips if touched roughly rack at the of... Be a problem unless i 'm doing rock castings with diluted acrylics the difference being is that is the commonly... To a dense, durable finish that resists paint absorption than PofP and way. 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