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Message: <blockquote data-quote="DaleH" data-source="post: 487879" data-attributes="member: 15636">Concern - At just test a few spots, poke with ice pick, awl or drill tiny hole in any pit. Do you see any evidence of WHITE corrosion? Aluminum can develop a self-perpetuating corrosion phenomena called "preciptate chloride corrosion" ... usually on boats in saltwater use. On a SW boat I had, the total refurb of new transom skins in my signature, as the test hold got bigger and bigger, I was still seeing a white layer inside the tin. You might need good light and a magnifying glass.If 'no' to the above, and whereas freshwater use only, my best advice would be to keep her clean and dry, as water or moisture helps cause where tin can corrode. You might want to scrub all areas with white vinegar on a copper scrubbie, then rinse, as the etches the tin back to a self-protecting oxidized layer.If pits OK, I think 'clean & dry with fresh air' (make sure cover has ways to vent or air out, etc., is your best option! You could fill the pits with a good epoxy, but then the area would need to be primed beforehand and painted over afterwards (epoxy can't survive sun exposure ... ) and it really wouldn't add any strength anyway IMHO, so I'd likely not even bother.</blockquote>