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But most of these "hardware store" rattle-can primers just don’t work very well on aluminum. Regardless of the printing on the can, they just aren’t very good on aluminum. Fine on steel, not so much on Alum.
Zinc Chromate – works great! And you can’t get it, and it will kill you.
Zinc Phosphate – Not bad, but not as good.
"Hardware Store" (rustoleum, duplicolor, krylon, etc.) – on aluminum, they all kinda suck. Bonding to the oxide layer just doesn’t hold very well. Better than nothing, I suppose, but in my experience, "not by much".
Whatever you use, surface prep is the key. hot water & soap, then hot water, dry it, then acetone, then naphtha, then do not touch it! (skin oil un-does the washing)…..then paint immediately