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Thanks for responding so quickly. I can not get a pic right now but here are some answers to your questions. My mold was handbuilt over a clay positive with a 50/50 pottery plaster and fine silica mix. Its about 1.5 inches thick all around. After air drying for about a week, I put it in the kiln and...

Hi: I have been doing some 10" open face casts about 5/8" thick and have been getting some white scum on the surface that is difficult to get rid of. From what I have read here and elsewhere, it seems that it is devit caused from being too hot for too long. My molds are a 50/50 silica plas...