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I have the same problem. Check out Nitesiters. They are adhesive dots that won't come off your sight. I have some on one of my Kel-tec's and really like them. The ones I have were some of the first they sold. After two or more years they are still on my sights. It looks like they have made a lot of improvements in their dots since I got mine. A lot of different colors and I see they now have Daysiters. Nitesiters Night Sights for Handguns !!!Better than Tritium!!!
Super Photo-Luminescent Handgun Night Sights
Transforms Your plain Sights into Night Sights!
Nitesiters are dots of Super-Bright Photo-Luminescent laminate that transform your regular handgun sights into very effective night sights. If you aren't thrilled with them, we'll cheerfully refund your money.
Nitesiters are up to five times as bright as tritium sights, are low cost and easy to install on your existing sights without a gunsmith. Nitesiters offer shooters a low cost alternative to expensive lasers and tritium night sights. For only $11.98, you can equip your handguns to be very effective in low light situations. Nitesiters are a real bargain for the confidence, security and service they can provide.
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