Senior Moment Member
Join Date: Jun 2011
Location: West Vancouver B.C.
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I'd recommend you get some auto body abrasive disks for use in an angle grinder. They look somewhat like resinated plastic kitchen scrubber material. They are not too aggressive so you can feather edge solid painted areas and they leave a nice finish that only needs some Scotchbrite scrubbing to be ready for paint.
If you are going to paint it yourself, forget the two part poly paints - they are very toxic and extremely fussy & demanding. Spray all the aluminium with zinc chromate for a primer/bond coat. The stuff comes in spray cans and is usually a sort of chartreuse colour - the larger Whale Gusher pumps are painted with it, if you know their colour. ZnCrO4 is the only thing in my experience that reliably sticks to aluminium and it must be put on immediately after the final abrasive step and a solvent wipe down.
Then paint with single part poly - Interlux is good.
I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.