I came up with the bright idea to make my toxic zombies glow in the dark, but I have never done anything like this before... I found a can of spray paint, and decided to test it out on my Toxic Abimination as he had the most skin to test on.
I'll have to go home after work and find it. I got it at Home Depot I think, or a hobby store. It claimed to be invisible until the lights go out. I can say that the only sign of the paint, is it makes the figure a little dusty feeling. I think it looks great. Sadly, I'll never play in the dark, so it's just for fun.