Styrofoam head mold

I want to make a plaster mold of one of those styrofoam heads they sell at craft stores. What should I put on the head before doing this?


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    I prefer epoxy
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    Any type of release that does not contain solvents (which may damage the foam) should work.  This could be a wax or something like Vaseline, which is what I would use.

    If you want a smooth or rigid surface on the foam you could coat it with epoxy as Justin suggested, then use any release you like prior to molding.

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