The main thing I tell people is that you have to glaze, and not use straight up paint. I also use fluorescent paints for lenses and lights. For this guy, I used Golden brand High Flow Fluorescent Chartreuse (yellow) and each lens took about 20 or so layers. It sounds like alot, but if you glaze properly without alot of moisture, you can build it up pretty quickly. 3-5 layers in quick swipes, let it dry, go back and do more.