I think that might do the trick for you. I just used some, can't remember if it's Rustoleum or Locktite brand, but definitely solvent based. Used it on the bed of my truck. Says it needs some rust left on to work. Turned the whole area I painted it on black and seems to have worked well. Also, I remember the can said it will actually rust areas of bare metal and won't work on any painted areas. FWIW.