I've put some sight paint on the rear night sights of my Kahr in an attempt to better tell the front from the rear if its really dark enough to need them (old age presbyopia makes it hard to focus), I just wanted to make them a bit dimmer or otherwise more immediately different than the front to speed up alignment.
Paint didn't hold up well in carry. I'm not really a fan of night sights, if its dark enough to really need them how, do you identify your target before shooting? How do you practice actually using them?