I've been using the same bottles of orange (Revlon) and white (not sure of brand) nail polish for more than 10 years. White undercoat and orange top coat on the full length of the serrated face of the ramp, whether blue or stainless. The orange does fade after a few years (haven't tried to keep track, so no exact times available) but it's easy enough to strip with acetone or lacquer thinner and reapply. And it has been WELL worth the effort. Especially on stainless front sights.