Where do you place zinc on a sailboat?

Then bolt a zinc plate below the waterline near the aft (so it causes the least turbulance when moving under sail). You'll need to connect a properly sized wire to the zinc and run that (probably through the hull) into the boat, connecting it to your vessel's negative ground system. {If your vessel has a positive ground system then consult with a qualified ship's electrician.

} Make sure any through-hull holes are properly sealed against water penetration.

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