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I want to make false stone looking planters from polystyrene heads. I bought the stone spray paint to use, but reading the instructions it says it's for indoor use only! I want to put my heads outside, what other type of product can I use on them?

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First of all, using regular spray paint on polystyrene will melt the material, damaging it significantly!

So, before anything else, I'd suggest either coating your polystyrene head, or using a polystyrene-safe spray paint.

  • To coat the polystyrene object, use gesso (or another acrylic primer), plaster, a polystyrene-safe primer spray paint, or even white glue.

  • Now you can safely apply the fake stone layer. You can opt for a spray paint that's suitable for outdoor use, or use your current spray paint, and coat it afterwards.

  • After the recommended amount of drying time, you can protect your creation with, for example, a clear acrylic coating spray.

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  • I was wondering if you've done this before, will it still look like stone with a clear protective coating?
    – user174174
    Apr 10, 2019 at 3:54
  • I have not done this before, no, but I think that will depend mostly on the finish, whether it's matte or glossy. You can also add a little texture to the polystyrene with gesso, so it won't look as polished once the coating is applied.
    – Joachim ♦
    Apr 10, 2019 at 6:49

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