Quote Originally Posted by RestoRod
You can use a mixture of Arm & Hammer washing soda, Draino or Lye (probably the first is safest) with water in the tank. Attach the negative lead to the rusty part and the positive lead to the sacrifical scrap pieces of iron.

http://antique-engines.com/trailer-electrolysis.htm
Using this method , what do I use to Paint and protect? Will epoxy premier be ok? This process leaves the metal black.