I'm not familiar with those paints. Do they seal the styrofoam? Are they waterproof when they dry?
Before trying your poly, test on the bottom of a wig head to see what will happen if some leaks into the foam.
Valspar makes a clear latex that should not eat the styrofoam. Once it's dried, it should be completely weatherproof. Kinda expensive I think. Ace has it.
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