Now for the not so good news.These products can only be carried by certain U S Gypsum dist.,due to their sensitive storage needs.This is straight from USG Chicago office.When I lived in Chicago ,there were only two places I could get these products,one in Cicero,one on Grand Ave.,and this was Chicago!Moved to rural Colorado,now the fun really began.Yep,I got it!,took weeks of calling and checking around.This is how I learned how hard it was to get if you don't live in a city.First it was going to be loaded on a truck out of San Diego,turns out they weren't allowed to handle Hydrocal.Next I found a place in Grand Junction who would go to Denver just to get my Hydrocal&Dental Stone!You can't stop a model railroader,so $35 a bag,60 mile ride to GJ,Igot my precious supplies.So,you can get large bags,it may take some real effort,but look at the stories you get to tell. Over the years I've used over 1500# of Hydrocal, and let's not forget Dental Stone,the real deal for casting rock molds.I've always bought these items in 80-90 pound bags. On the positive side, think of it as building a layout that will last a looooong time. This toughness can make things difficult because it is pretty difficult to carve or change things after the stuff has set up (unless you break it out and start over). I personally still prefer hydrocal because it is so tough. I have several buddies who like casting plaster better than hydrocal. Takes longer to set up and has the wrong texture. There is another product by the same maker called hydrostone: Avoid it. (not Home Depot) I think they use it to repair old plaster in houses built in the pre-drywall era. I reccomend finding the supply house in town that services lath and plaster construction workers and remodelers. It sets up hard enough to scrape your knuckles on it. The only way to remove it was to wail with a sledge. Similar to White Art Plaster, but with slightly higher chip-resistance and reduced paint absorption,No. The stuff was so hard that when I was taking down the layout, it bogged down a sawzall. 1 Casting Plaster is the industry's premier casting plaster for fabricating figurines, plaques and lamp bases. I love hydrocal and found the whole carving thing to be very therapeutic. feet of rocks on my last layout and I went through about four 100 lb.bags (I covered a layout 4x16 with mountains). One of the hardest and strongest Hydrocal® products, Hydro-Stone® Gypsum Cement is used in the fabrication of high-quality art novelty and statuary castings.I concur with the other posts about hydrocal being very strong. Hydro-Stone® Gypsum Cement - For Art & Statuary NOTE - For best storage results, keep indoors in a dry, stable environment, away from drafts. Requires 32 parts water by weight per 100 parts plaster.Sets in 17-20 minutes, after machine mixing.Adapts to most flexible moulding compounds, due to its high absorption resistance.Features a heavy, syrupy consistency, ideal for pouring into solid models or patterns (and making it ideal for filling multiple molds simultaneously).Offering greater expansion than Hydrocal® A-11 or B-11 gypsum cements, Hydro-Stone® Gypsum Cement: Hydro-Stone® Gypsum Cement is ideal for stretch-press dies where extreme surface hardness is required. Hydro-Stone® Gypsum Cement - For Tooling & Prototyping It is ideal for applications in both the tooling & prototyping and art & statuary categories. Hydro-Stone® Gypsum Cement is especially suitable where high strength and resistance to water absorption are necessary.
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