Painting aluminum that is not new is always a crapshoot b/c tiny pockets of corrosion fester and enlarge under the paint. You can't really get good zinc-chromate primer any more at retail either. Putting a nonskid directly onto/into the deck with a grinder sounds foolproof altho it too will corrode in time. I would email a couple of deck coat manufacturers (Evercoat & Kiwigrip come to mind) asking about prep, priming and adhesion to aluminum, ask for samples. Use only products that are meant for aluminum as mentioned repeatedly above is good advice. Sand, acid wash, prime in small sections.
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