My radiator overflow tank developed a small leak between the top and bottom halves so I brought it to the rad shop and had them bead blast it, separate and resolder the halves back together, and re-weld the mounting brackets for the sum of $50. It seemed criminal to repaint the brass so I wet sanded with 1000 and 2000 grit then polished it some with Flitz followed by Collinite metal wax. I did paint the brackets to keep them from rusting. Should develop into a nice rich patina over time. I know it's not factory, but damn it sure is purty.