Painting styrofoam

[Tomkat364]

Best solution would be to use acrylic paint with an airbrush if you have one (which I assume you don't or you would have thought of this.) You can pick up some really cheap airbrushes these days. Also, have had no problems spraying Tamiya gray primer onto Styrofoam in the past. Seals it well and acts as a great surface for painting.