Just go to your neighborhood drugstore and check out all the fingernail polish. I found some nice green and orange/red florescent stuff for only a few bucks. I usually redo mine each month because I fire them every week. I would also look at fiber optic sights. I made my own with some fiber optic tubing I had. Just drill out the holes and locktite them in...works great.
I've been running Bright Sight paint on my BP9CC for quite a while now. I went with the bright orange and really like how much more visible the dots are now. The BP was my test case and now all my firearms that don't have night sights have orange sights.
My father gave me some powdered phosphorescent paint that he used for fishing lures that I have been experimenting with on different things, I am about to try it on my P32 as a test for firearms and will post my results when I have not only done it but fired it enough to get a good feel for things as well. Main thing I am concerned about is that they need to be heated for proper installation, and I plan to use clear nail polish to seal them on as well, but not sure how it will handle cleaning solvents, so when everything is tested I will post it up.