Florescent model paint works good also. I have some Yellow and Orange that I picked up at Walmart a few years back. Clean it good and use a toothpick to apply the paint.
Another great product that I've used is Nightsiters florescent dots and strips. I have their dots on a Kel-Tec PF9 that's been on it for years. Nitesiters Night Sights for Handguns !!!Better than Tritium!!!
USAF Retired, CATM, SC CWP, NH NR CWP, NRA Benefactor
To preserve liberty, it is essential that the whole body of people always possess arms, and be taught alike, especially when young, how to use them... -- Richard Henry Lee, 1787