Thanks for all your input. I will try what Shirley describes and see what I get. The plaster in the bag is pretty much like flour, with some small rice grain size bits that break up when I squeeze them between my fingers. If that amount seems viable, then I will use the ratios given on the US Gypsum site.
clay loverMember Since 08 Apr 2010
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12 years as a potter, student, always. Cone 6 - functional, mostly.