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My experience with spray paint on plastic is that it generally doesn't hurt the plastic, and you can tell because it doesn't stick very well, so you get to check the plastic's condition after a while. Ask around. Try modeling shops.
You could buff the plastic surface very gently with some 100-150 grit sandpaper, give it just enough of a texture for the paint to grip mechanically. Once you've got your paint sticking well, you can follow up with more coats to give it a proper shine.
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Lead or follow. Either is fine.
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