my glock 22 has a scratch on the back of the slide where the black finish came off and you can see the polished metal under it, nothing else is damaged except the finish. Is there some sort of touch up kit or paint/spray i can use to cover it up? i also have a remy 870 that got wet and somehow rust spots took off some of the finish on the lower receiver... these guns are fairly new and i know i should take better care of them but i do let other people borrow them and i know they abuse it.