I used Blue Wonder on a S&W Model 10 about the years ago, and it is holding up pretty well BUT I have found that surface rust forms on it prettu easily. That could be due to the texture I created by blasting with glass (I think that's what I used for blasting, but CRS comes into play). You must follow the instruction with BW or it just does not work at all.
I've also used Moly Resin a few times on small parts and a Charter Arms revolver. It seems to hold up well. I am about to do a complete rifle with it for the first time. We'll see how that goes.
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. Intellectual honesty is not for fragile egos.