as a belly dancer i've done some tribal shows here and there in a few clubs, the uv paint looks friggin awesome, but like Pele said, if you think you're going to be sweating your balls off, or going to be up on stage long enough for the lights to make you sweat, forget about the paint cause when it starts streaking it looks horrible and if you have it on your face it can get into your eyes and it STINGS! at least in my experience. if i know it's going to get hot, i usually stick to paint on my forearms and upper arms, where i don't sweat as much, still looks pretty cool and less likely to streak unless you hit it. if you want to play up the black lights, but don't want to wear the paints, wear white, that will still have an interesting affect and it won't wash off!!
good luck!
Excelsior!
Tori
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Fruit don't talk...they listen...and wait.