I've done hot bluing, regular slow rust bluing with good results in the past. I have a rifle that I am going to strip down and blue. I have been looking at the Mark Lee Express blue at Brownellsa and I am debating trying it. Does anyone have a gun that has this applied to and how does it compare to trus slow rust bluing as far as durability? I'm not looking for cheap cold blue stuff, but if i'm reading correctly is it basically a true rust blue? I don't mind putting time in doing it slow but if Mark Lee stuff is decent I wouldn't mind shaving off some days. Read on some old posts here it seems to work well, but I want something that will last and protect, not a cheapo cover up job that comes off .