Not sure how it works on aluminum? As far as gel coat mine is still looking really good after 9 years. I got this idea from a boat detailer that did it for a living or I wouldn't of never thought of using it. I only use it a 2-3 times a year. (I also wipe my boat down every time I put it back on the trailer). I apply it right out of the bottle scrub with my boat brush and work quickly, then rinse quickly using a lot of water or my power washer. I don't let it soak, plus you don't need to it works quickly.
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