Rattle Can or Brush on Self Etching Primer? Aluminum Boat & Jon/V Boat Discussion Forum

I have looked at paints in a couple of hardware stores and have not found any primers that say "self etching". Many say for metal, but don't mention self etching, and claim "rust" preventatives, so suspect they are just for steel. I can get zinc chromate (green stuff) from a marine store, but

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How'd that paint job hold up? Boat Rattle Can Paint job