OK, I just jumped in and am about 5 hours into this-here is the report:
1. Baking Soda, cheap and easy to find, seems to work, dont know how much to use, went with about a tablespoon a gallon.
2. I dont know if the baking soda gives itself up during the process, and thus whether the amount is important.
3. The reason an earlier post so completely wrapped his tank is ... I dont know, but I had an issue with the condensation of the process collecting into the spray paint cap/anode covering the gas cap hole and then weeping back down onto the tank, it was dripping pretty good, did not seem to damage the old paint but you would not want to take a chance.
4. I solved the weeping wet tank issue above by adding a vent line from the anode holder to a small vacuum source (old aquarium pump using the vacuum side, no more weeping.
5. After four hours i drained and looked-Lost of rust had vanished, much remained, the anode was ugly, and a nasty rust/crap froth was collecting at the gas filler hole, so leave yourself 1/2 inch or so for this muck to stay in the tank. The rust that remained that i could get too was loose and seemed to be dissolving, for some reason i thought 4 hours would do it, but i read the earlier post and its maybe two days...good thats its february.
6. i have restarted the process and used alot more baking soda.
7. Amperage dropped fro 4 to 2 amps quickly, I noted about a 20 degree f rise over ambient during the process. Might be nice to know since temperature is easy to monitor whether the end of the process can be determined by an increase or decrease of temperture or amperage...
