i paint my sights.clean the front sight of all grease and then put on a coat of white paint for a base.then put on a coat of flourescent paint.ive always used orange but im sure others would work.if you dont have a small brush a q-tip or toothpick will work.then i outline the notch in the rear sight with the white paint.never tried it but maybe you could outline it with flourescent paint too.dont know till you try.just something to try .
good luck

I always zero at 75 yds. It will be close to on from zero to 100.