Hey mate, much to my disappointment, its pretty tough foam. I’ve just been using a thin coat of PVA glue, but have dipped some foam in acetone and it didnt affect it that I could see, so you should be fine… Blain painted his one, no idea what with.
There will be a few corners you can assault with chemicals to test..
Doesnt melt that easily either, I tried a “lost foam” style cast with molten aluminium.. miserable fail. I do however have an asp that looks like the thargoids hit it with a plasma weapon tho..