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I painted an aluminum boat we use for duck hunting at least 12 years ago and we washed the al. first with vinegar which I believe partially etches the al. Then scrubbed with a hot water and TSP mix, rinse thoroughly let dry and painted. That paint has held on with no problems.
As far as the seat, while I wouldn't be as concerned about the integrity because you have 3 others, be careful because they usually have the closed cell foam flotation encased under these seats and you will change the buoyancy of the boat.
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