Maybe there's glow in the dark paint and GLOW IN THE DARK PAINT.
Many moons ago I found a GITD pen, and proceeded to put dots all over my bedroom ceiling - just a few every night. After several months I had the most awesomest starfield, that glowed brightly for several minutes after charging it up for a little while with a halogen bedside lamp.
Saw some GITD paint at Bunnings (like home depot, only less so), so I grabbed it, a tiny (art) paintbrush, a black light globe, fitting, lead, switch etc. Time, money and effort, and the crap stuff hardly glows at all :'( Had to get the kids a 'disco light' instead.