Oxpho is great for touch up or even a complete gun, while it's durability is superior to other cold blue it's still a cold blue that will not good up as well as hot blue, I stated work in a machine shop back in the 70's we used cold blue on many of the parts we manufactured, we bought in bulk, I blued a old mauser, I completely stripped in down and polished it out and degreased, the finished product looked absolutely great, however by the end of opening weekend of deer season that fall the receiver and floorplate were showing white from being held in my hand after just two days of hunting, some time later i bead blasted same gun and blued again hoping the blue would hold better to the textured finish of the metal, again looked great upon completion but just didn't last long,