With the reintroduction of water to any plaster, a new interlocking. of plaster to make a workable slurry whereas gypsum cements require 22-45 lbs. i'm quickly remembering the days of "workin real fast" with this stuff. The term 'gypsum cement' refers to harder and higher strength plasters manufactured by using heat and pressure. I also used the sculptamold on a mold made from plastic (WS tunnel liners) and i didnt have the issue?įinally, please steer me straight, does warm or cold water (or vinegar?) add working time to plaster. could the powder residue act as a dessicant on steroids? When mixing Hydrostone, the consistency should be approximately 32 parts water to 100 parts plaster, and the set time is about 17 - 20 minutes - yes, this. I may have had some talcom powder residue in the latex mold as i followed someones advice on this score to preserve the molds etc. I dont beleive my mix was bad and it certainly was given time to set. the majority of the casting is hard but again, the area that counts is worthless. if i rubbed the detail lightly with a finger it came off. Well, on my first few attempts with my new home grown molds i found after i released the casting that the sculptamold near the mold, ie - the part of the casting with all the lovely detail, was "soft". ![]() I spent the extra (alot extra) to purchase a few boxes of lightweight sculptamold (sp?) which is new to me, in the past, like 20yrs ago, i used reg plaster for this work. I made some latex rubber molds of portals and retaining walls as well as some rocks from the yard. ![]() Hi guys, been some time but enjoying reading the forums again and need to ask aobut a problem i am having with plaster molds.
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