They make a glow in the dark nail pollish thats only $3 or $4. It goes on mostly clear but when the lights are turned off it glows pretty bright. I use it alot on lures that are already painted. it has very little to no effect when the water's clear but as soon as it turns murky it starts to glow. It's kind of interesting to play around with and is pretty easy to find (as long as you don't mind walking up to the cash register with nail pollish made for 13 year old girls).