Posted: 03/04/2015 at 11:11
If it's painted, then you need to remove that, assuming you want to make it look totally rusted. Nitromors will do that with a large dose of elbow grease, but it will take a while afterwards for rust to take hold. You can speed up the rusting process by painting it with s salt solution. Less hard work would be to have it sand or bead blasted (contact a few automotive restorers for that type work) but it will cost a bit.