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On aluminium centerboarders, here on the other side of the earth (australasia) i will suggest the sandblasting, phosphoric acid cleaning, Altex primer #1, altex primer #3, and the antifouling coating. Is this strategy transferable to iron centerbords, that's the good question.
However on my 42 ft centerboarder (2 centerboards), this is not the place where the fouling grows fast. Probably it's too dark for them?