While getting the interior ready for new carpet I decided to pull the seats and package tray to clean them up. There was a water leak in the back window so the package tray got wet. The good news is it is not fiberboard...it is sheet metal (or some version of metal) with a black vinyl layer on top. The metal has some minor surface rust in each corner. What is the best way to fix this? Sand it down and put a new layer of vinyl on it? Paint it? I am not sure what to do.