Originally Posted by
ticwanos
Has anyone considered making a paste with oxalic acid dust and molasses and "painting" it on rust spots on a frame that needs a little tlc? I have a frame with some nasty chain slap, but don't want to dismantle the whole thing for an oxalic bath. Worst case, a chemical combo would make a weapon of mass destruction (not likely, but think ammonia and bleach). Best case, I'd be able to remove rust only in a small selected area. Any thoughts?
I tried making a thick paste of mostly Bar Keeper's Friend and a sprinkling of oxalic acid. I left it on for a half an hour. The chrome came out splotchy and mottled.
Later, I made my usual weak solution of oxalic acid and water, soaked a strip of rag, wrapped it tightly around the rusted chrome dropout and sealed it with plastic wrap so it wouldn't evaporate. I repeated this a few times and it came out great.