Originally posted by Don Meyer
Pits in metal can be removed with Ospho. It's sold at NAPA.
Don
Ospho works great to convert rust but beware. It does some tricks that depending on what you are doing with the rusted part, you may not appreciate. It leaves a white powdery residue that is hard to get rid of despite directions on the container that say "Just wipe it off." Any ideas out there?
Ospho has one other quality that isn't talked about much. If you use it for spot rust and get it on adjacent paint, it can lift the good paint. I used it on a John Deere tractor, on recommendation from my friendly Ace Hardware man. He said to paint it on everything and it would kill the rust and etch the old paint making the new paint stick better. Sounded good, so I followed his advice. The next day, the paint looked like it had been coated with stripper. Between the white powder, and the wrinkled paint, the job ended up a mess that required sandblasting and a complete paintjob from scratch. Mad at myself for not trying it on a test surface first. Ospho is good for treating rust. Just dont get it on good paint. MetalPrep converts the rust and doesn't leave a residue One other point. You won't get help from the makers of Ospho, SKYBRYTE Inc. You can't find them on the net.