I've used several coatings and Cerakote is by far the best. It is extremely tough. Although I have never used it when I was buying my bluing salts they had a version for stainless steel. I have no idea what the finish is like but the up side to it over other coatings is you don't have to glass bead it first so it maintains it smooth polished surface.

I won't be wronged. I won't be insulted. I won't be laid a-hand on. I don't do these things to other people, and I require the same from them. John Wayne-The Shootist