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post #9 of Old 10-16-2011
Fstbttms
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Of course it is possible to over-protect a boat with zinc. When creating a galvanic cell (such as when protecting an underwater metal part with an anode) the water around the part becomes alkaline. Many anti fouling paints are softened and blistered by alkali. Hydrogen bubbles may also form under the paint surface, causing it to lift off. The more anodes you use, the worse the effects. I have seen many, many examples of anti fouling paint being damaged like this.
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