I bought a products similar to this from The Sportsmans Guide for about $5. It comes as a two-part paint - one primer, and one with the glow pigment. I applied it with a toothpick and it seems to work nicely. The only complaint I have is that if it is in the holster, the rear sight is exposed to ambient light but the front site is shaded completely. On the "brighter" side though, it only takes a second or two of light to get them to glow. It's not as good as real trijicon sights, but considering the $5 price tag (and that gives you enough to do a dozen or so guns) it's worth the extra measure of visibilty. For a full-time CCW gun though, I'd probably cough up the extra few bucks and get a good set of REAL night sites.
-John