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We have a volvo saildrive and we use a zinc guppy on our sail drive bolts run out of the lazarette and over the side.
The guppy doesnt grow crud which we assume means it is working, but we've had the same zinc for 3 years. With that being said, we don't lose our sail drive zinc very quickly either.
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A l'eau, c'est l'heure
s/v Estrellita 5.10b, Wauquiez Pretorien 35
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