Having tried this job in the past, I suggest a few things: (1) I would complete the removal because chances are the old paint will continue to flake under the new paint (2) After removing with your sander, you need to use really fine grit (800+) wet and dry paper wetted to finish the preparation (3) paint with zinc chromate x2 coats (4) ready to apply 2x coats of your preferred finish paint. I use spray cans but it is difficult to control over-spray, especially if there is any wind at all. I think if I ever tried this job again, I would brush on and probably use a water-based aluminum paint. Unfortunately, even with all this prep, repainted aluminum does not stand up as well the original finish. Good luck!!
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