I am not sure epoxy would work in alginate. You may have to make a plaster cast and then make a mold from that. I cannot remember which materials are useable with an alginate mold. I know you can use soap, chocolate, plaster, and one of the plastics but I am having a hard time finding my notes on what worked and what did not.
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http://www.google.com/products?ie=UT...num=1&ct=title
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