I used Day-Glo Orange paint from a craft store on my G30 sights. I hate white sights in any firearm. You can also use bright nail polilsh from the local drug store. It's a bit brighter if applied over white.
Glow-in-the-dark paint? Don't know how effective that is. It usually has to be exposed to light first and then fades, which defeats the purpose.
There is a commercial brand of sight paint, but it's pricy for a little bottle, and craft paint/nail polish works better. The polish comes in flouresent yellow/orange/green etc.