I'm getting ready to seal the inside of my tank with Caswell. I took out the sending unit and petcock and the inside of the tank has surface rust but no scale. Basically in pretty good shape. In your opinions would I be better off just cleaning with acetone and rocks or screws and cleaning it and leaving it alone or would you go ahead and seal it anyway to keep the rust away forever?
Controversy abounds on this subject; some people remove the rust using phosphate/Evapo Rust/electrolysis and then call it done and others like to seal the metal using one of the popular sealing kits. The sealing kit sellers like POR-15 and Caswell's will tell you that you don't even have to remove the rust before applying the sealer. My opinion is to remove ALL the rust using one of the methods already mentioned and then decide on the next step. I tend to prefer to seal the tank unless the rust is light.