Well, I got my Krypto Nyte powder from the seller by the same name. This has to be the cheapest option out there- I got 2.5 grams of 'pure' strontium aluminate powder for a buck(!), and for that price, the results are perhaps a little better than I expected. This stuff is inactivated by water, so don't mix with water-based paint, and keep it sealed from the air if at all possible.
While I was waiting for the stuff I researched optically-clear epoxies and found a seller on ebay for that also. I didn't get it in time, however, and so today I mixed the Krypto-nyte powder with glow in the dark Krylon spray paint to try to up the glowness.
The powder is very inert, and does not 'like' to stick to anything, so my initial plan of painting the sights with a thin layer of krylon (I just sprayed some onto a sheet of newsprint and dipped a fine brush in it) and then sprinkling the glow powder on them didn't really work.
I ended up mixing in as much powder as the paint could hold and still be somewhat paint-like. It became more like liquid bondo or paste. Not the best medium, that's for sure. I'll likely scrape/sand off this effort when my epoxy shows up. I 'painted' the entire rear of the front sight and most of the rear, making a bit of a mess (I'll clean up the excess after it dries).
Anyway, in the short run, this is the result I got:
This is after setting the pistol on my windowsill for a few minutes. The initial result is very bright, much brighter than the glow in the dark paint I had tried before. The stuff still fades pretty quickly, but since it is much brighter to start with, my sense is that it will remain at a usable brightness for a while longer. The craft paint I had tried was only effective for a few seconds after being illuminated by a flashlight.
Note: apparently this stuff responds well to UV (as per Fuego also), so I'm going to convert an old Mag light pen light to a UV LED with the hopes that it will be a good way of charging my sights at night.
Last note: The best glow-stuff out there is strontium aluminate doped with dysprosium and europium (Empirical Formula (Hill Notation): Sr0.95Eu0.02Dy0.03Al2O4). I wasn't able to get a straight answer from the folks at Krypto Nyte if theirs was thusly doped, so judging by the price, I'm thinking probably not. It's pretty good, but not insanely bright like I was hoping for...
Edit: I was just reading up on tritium, and apparently it emits in the UV range that this stuff likes. I was thinking that maybe the best night sights would be a tritium tube with a ring of strontium aluminate (Dy,Eu) paint. Then the tritium would charge the glow paint continuously, and you'd get more bang for your buck. Come to think of it, is that what the TruGlo sights have?