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Rust bluing is a different process than hot tank bluing. For instance, double barreled shotguns that are soft-soldered together can't be hot blued- they would be rust blued...or else.
Rust bluing is a process where the parts are polished and degreased, then immeresed in bioling water. The parts are removed from the boiling water, and the rust blue solution is swabbed on the parts. They are then immersed in boiling water. The second time they are removed from the water, they are "carded", or rubbed with 0000 steel wool to remove the scale. Your best bet is to degrease the steel wool before use, by the way. The whole "dip, swab, dip, card" is repeated until you're satisfied with the results.
The upside is it seemed to me to be a bit tougher than hot tank bluing. The down side- labor intensive. The potential for scratching your work and having to start all over again due to all the handling required should be perched right on your shoulder when doing this, by the way.
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