hereford,
At one time I started making a small outfit to do small items like parts for guns that would have the barrels rust blued, pistols, etc. the same as you are asking about. I was planning to use a 50 cal. ammo can for the tanks and made a tray to fit inside from a heavy gauge iron wire screen. The plan was to use my 2 burner propane camp stove for heat and after cooling put the lid back on the ammo can for storage under the workbench. I never finished it and in the meantime I moved and am now too old. Be sure to let us know what you decide to use and how it works out. Don't wait too long like I did and wind up having to rust blue screws, pins and all the other small parts.
Mike
