Cat, I had an old aluminum that I completely repainted years ago. I took some light grit sandpaper with an orbital sander and just scuffed up the paint. The old girl did not look so bad when I finished but decided to repaint it anyway. I used a paint from Sherwin Williams that they had for aluminum and applied it with a brush. After all of that the boat looked good for years until I sold it. By the way I got what I paid for it.
