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Going bump in the night..
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I've made plaster molds before using foam as a base, but I made certain I had coated the foam in a few coats of paint to seal it up well, and used lots of mold release (petroleum jelly worked well for me).

The advantage to clay is that it will remain pliable (if your using an oil clay), so removing it from the plaster mold won't be more difficult than pulling out, and maybe picking out some scraps in the tight spots.

Just be certain to add plenty of fiber to the plaster mold when you're laying it on - plaster really is quite fragile without something to strengthen it.
 
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