Fi Fa Fo Fum!
As I've been getting a private message mini bombardment concerning UV paints. I though I'd post my advice here as well. Seemed like the decent thing to do. ^^
I bought the paint off of Ebay. My general advice would be if you have a choice between a cheap and an expensive brand, go for the expensive one. The difference will be noticeable and worth it.
You can treat is just as any other acrylic paint, with the exception that it does tend to dry out very quickly, so work with small amounts on a palette and make sure you close the bottle asap. Also, store it in a dark place. When still runny, you can apply it using any brush but also, you'll notice that when drying out, that the paint becomes very snot-like. I actually used that to my advantage to apply it on that bust's veins. You can apply a drop on a starting point and stretch/drape it where you want using a toothpick. Best is to work in multiple layers as the better the coating, the better the glow-in-the-dark effect.
Here's the one I bought:
Glow in the dark Nano AQUA Paint -SUPERIOR GLOSS | eBay