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Originally Posted by noelex77
The corrosion risk above the waterline is not zero. If any stainless steel fitting is not isolated properly you will get electrolysis even above the waterline.
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Noelex77, I was trying not to be pedantic. Yes, on *any* boat *any* proximity of two metals causes electrolysis, given moisture (electrolyte). But this applies to fittings in general - bronze, brass, aluminium and steel on masts, shackles, bolts and accessories. The good news is that exposed aluminium above water does not "rust" like steel, does not absorb moisture and bloat/delaminate like some fibres - indeed it forms a protective layer on its own.
Quote:
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Originally Posted by noelex77
I may be wrong but I think you are misunderstanding the purpose of the paint underneath the antifouling below the waterline. Its main purpose is to simply isolate the metallic antifouling from the hull
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Well, it does both, though the choice of antifouling is a topic of its own, and metallic antifouling is a no-no; e.g. common copper-based paints are not used on aluminium.
I have spoken to a few owners, and the corrosion problem that concerns them is the propeller area - like on most boats.
Anyhow, here are photos of my boat, with the hard coat, then antifouled (blue). Finally, run ashore for a show in Oslo; as you can see, getting to the hull for maintenance can be pretty easy.