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May 11, 2010 at 3:40 pm #11619
While I’m a new fuser and have not used hydroperm molds, I do have info that may help. In Brad Walker’s book “Contemporary Warm Glass” (p48), he describes 2 types of gypsum cement molds: hydroperm and hydrocal. In his description he writes: ” By contrast, gypsum cements do not need kiln washing. They are also able to pick up more detail than the other kinds of cements.” Good luck -your project sounds like fun.