10. After all of the holes were filled and the welds smoothed, I took the bumper to Beo-Mag Plating to have it made shiny again. The first step (and the one I didn't get a picture of) in the chrome process was to strip the bumper down to the base metal, which was done in a reverse-current sulfuric acid bath. After the part had soaked enough, all of the old plating was gone and the bumper was ready for the copper stage of the plating process. Not only is copper a soft, easy-to-buff metal, it also allows for better adhesion and longevity of chrome plating. When the bumper came out of the copper tank, it was sent to a polishing station to smooth out any small defects (much like block-sanding does for a paintjob).