Ok guys, here's what I've got so far. I have a plaster block that resembles a stock, (its just flat on all sides). I want to make a mold of that out of something to basically have a negative of the stock. I have some left over 2part hobby foam, (i cant recall the manufacturer, but it expands up to 20x the poured amount.) Is this ok to use as my foam that you guys are referring to? If so, what would you recommend I use to go over the foam? Epoxy resin and fiberglass mat? Just epoxy resin? It really doesnt matter what the color or appearance looks like, because it will be painted; I just want it to be strong enough to handle being used.