[Sproket]

The best dye I have come accross is the UV dye for radiator testing from Checker Auto parts store.

Also the highlighter dye is very strong but maybe to strong for pump drive. Im guessing here and have no facts to stand by. Its just when I smell the UV mixture from highlighter, it smells strong. Hmmmmmmm.

And when I smell the dye from Checkers, nothing.

I made a order from some dye from another company and waiting on them.