I have a stoeger 12 ga. sxs that is a couple of years old. While giving it a thorough cleaning, I noticed that the bluing is either wearing off or defective in one area. It's more like a bunch of pinhead size dots than a solid wear spot. Anyway, from what I've read, it seems as though touchup won't match the original and it's way before being severe enough to blue the whole barrel. Can anything be done to slow the wear process?