Tim
I have done a few, mostly 22s and one shotgun. Brownells sell a steel tank pretty cheap I put it right on the kitchen stove it spans two burners. Just need to get it off before the wife gets home. I only use enough water to cover the barrels it will boil in about 10 min.
I Finnish the barrels to 400 grit by hand no machines for me. I have used Brownells rust blue or pilkingtons rust blue. For a sweat box I have a small stack on gun cabinet I think it's for eight guns it's pretty cheap but makes a great sweat box. I put a rack on top to hang parts and a crock pot in the bottom for heat and humidity.
In my experience once the rust turns red pull it out and boil, don't let it sit longer it will tend to etch the metal deeper than I like. Blueing gives me tremendous satisfaction, hope this helps.
Tom
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