I've seen glow-in-the-dark paint in the craftstore before but in my experience it isn't so great. That said I imagine a black light and some neon/flourescent paints will do the trick, but the blacklight is going need to be your only light source for you to get the full effect. Both Apple Barrel and Testors Model Master Acryl make flourescent paints in a variety of colors I would start there.

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