I have seen a set of electric heating rods used, but they were home-made & I have no idea where to get the materials. The idea was boil the barrels, use the heating rods to remove any water from between the ribs, card, reapply rusting soution, repeat. It worked well on the set I needed help with. They were just 1/2" diameter heating elements of some sort. Hopefully someone will know a source.

Bryndon