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I put plaster on unpainted expanded foam mountains 6 months ago. No problems. I also used spackling compound over some hills at same time. No problems. I even put flock grass right on it with glue, but painted these areas first so thin spots didn't show. Here's a tip, you can smooth and sculpture expanded foam with trash bags when unset and they peel them right off when set, but the trash bags add days to the setting time. Plaster, spackling paste, and whiteglue sticks to expanded foam really well, it soakes into the pore and makes a mechanical bond. You will destroy the foam trying to remove said items. Painting would reduce this bond.
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