Prepping a late series gas tank. It has been professionally stripped, but has a black residue that has resisted my efforts. I have soaked it with Strip Ease (three days), Methyl Ethyl Ketone and Acetone (24 hours). I have been agitating the solution with a length of chain that had been inserted. Dumped the witches brew. It contained small black gritty flakes. The liquid portion was yellowish. No sign the black stuff has been softened. I have considered the possibility the black stuff was blackened steel and not a coating. However, the black flakes point toward old coating. I successfully stripped a pair of tanks twenty years ago, but have no recollection of what I used.
Any suggestions as to what will remove this stuff?
Bill
Any suggestions as to what will remove this stuff?
Bill