If you are looking for something to glow blue, you guys might want to try Rit Whitener and Brightener... you can find it with the other laundry detergents in most grocery stores (I found some at K-mart also). The stuff definately glows blue, but it's not as bright as some of the other UV dyes (like hilighter or leak detector dyes). I don't know if it'd mess up your pump, but i'd assume it wouldn't be that great for it, especially since you need a decent concentration to make it bright.
I am using it, instead, to paint my clear fans... I mix the Rit with a clear coat paint (nothing with UV protection) and paint the fans... then they glow bright under UV, but are clear the rest of the time. Sorry, no digicam to show the pix..
