I own a powder coating company and we now and again have things that start to rust between the time they get blasted and the time we get them to powder coat them. I figured on a whim that this stuff might actually work, so I tried it. It actually does a really good job. Requires a little bit of rubbing, but not much. It also does a fantastic job of stripping the plating off of bolt heads so you can coat them and get the powder to stick properly. Make sure to neutralize it with "Pre" or Acetone before you powder over it.