I've been sanding the last few days, and still have a lot more to go. Although it takes a lot of time/effort, it's pretty incredible what a difference it makes! Pictures are: 1) Flite Metal as applied- not sanded, 2) sanded with Scotch Brite pad- brings out an "orange peel" effect from the glue backing, 3) 320 grit sandpaper- starting to remove the orange peel, 4) 400 grit sandpaper- bringing out a nice shine. The surface needs to be cleaned really well before painting, and will be polished when everything else is finished to stop (slow) the oxidation