It may not be the issue in your case, but it is not unknown for alloy boats to end up with pieces of inferior quality 'marine grade' alloy. i am working on an alloy boat at the moment that has pieces or corrosion on one side of the hull but is perfect on the other.. Why build an aluminum boat? for things that go bump in the night. for ease of construction. for longevity. for good resale value. for the benefit of being able to create a custom design and build it economically, without the huge penalty of having to build a mold first, as with fiberglass.. Buy aluminum paint - metallic coating -- mcu aluthane: anti corrosive rust resistant. a moisture cured urethane, aluminum paint, aluthane (tm) was specifically formulated as a primer over less-than perfectly prepared surfaces..
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