http://www.soapcrafts.org/mold-wax/
When casting into a plaster mold with latex, does the plaster have to be sealed first?
Will the latex stick into the mold or is a coating of sealer or wax required? Also, when painting the finished latex piece, do you have to seal the latex before or after?
Thank you for any information.
My experience with plaster is that it almost always needs to be sealed except when using clay slip. I use Murphy's oil soap as suggested many places. But, while I work, with latex, I have not cast it into plaster as I paint it on modeling clay and you need to ask a latex supplier because thick latex takes forever to dry/set so you may need unsealed plaster to suck the water out of the liquid.
Edit
I went looking and this site http://www.fxwarehouse.info/Merchant2/merchant.mvc?Screen=PROD&Product_Code=CLX1&Category_Code=RD407 which explains the process makes it clear the plaster mold must be unsealed.
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