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Made a discovery while working on boat. Help!
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<blockquote data-quote="DaleH" data-source="post: 408829" data-attributes="member: 15636"><p>Only very few - and limited use at that - epoxies have any UV inhibitors in it. Epoxy must be painted over for UV protection.</p><p></p><p>Are you using this hull in saltwater? Is it moored or just transient use? But WOW, it seems like we're seeing 'pits' on surfaces that aren't anywhere near a seam or rivet. Did you coat those areas? </p><p></p><p>Hate to say it, but unprotected aluminum in the salt is just asking for trouble. I don't see anyway around it but prepping-to-bright the tin and etching with a good 2-part zinc chromate primer. Then sealing if/as needed. You might also want to be looking into Steel Flex. </p><p></p><p>That said, I bought an old '78 12' tinny that was always used as a skiff in the salt. It was prepped and steel flex'd many years ago and its still sound. In 2 spots that look just like yours, they added what appears to be gray colored 3M 5200, but that isn't made in gray. Maybe it was a Silka-flex product?</p><p></p><p>Regardless, it is still somewhat hard, yet still pliable and since it was added over properly primed/etched aluminum, those 2 repair areas are still sound and there is no adverse corrosive attacks in those areas.</p></blockquote><p></p>
[QUOTE="DaleH, post: 408829, member: 15636"] Only very few - and limited use at that - epoxies have any UV inhibitors in it. Epoxy must be painted over for UV protection. Are you using this hull in saltwater? Is it moored or just transient use? But WOW, it seems like we're seeing 'pits' on surfaces that aren't anywhere near a seam or rivet. Did you coat those areas? Hate to say it, but unprotected aluminum in the salt is just asking for trouble. I don't see anyway around it but prepping-to-bright the tin and etching with a good 2-part zinc chromate primer. Then sealing if/as needed. You might also want to be looking into Steel Flex. That said, I bought an old '78 12' tinny that was always used as a skiff in the salt. It was prepped and steel flex'd many years ago and its still sound. In 2 spots that look just like yours, they added what appears to be gray colored 3M 5200, but that isn't made in gray. Maybe it was a Silka-flex product? Regardless, it is still somewhat hard, yet still pliable and since it was added over properly primed/etched aluminum, those 2 repair areas are still sound and there is no adverse corrosive attacks in those areas. [/QUOTE]
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