Here's a different question about Zinc fish: I have one over the stern, with the clip attached to my grounded backstay chainplate. It has been getting coated with a white plaque, I assume Zinc Oxide. I've read that this can happen in brackish water, but we're in Friday Harbor, which is pretty salty. Any suggestions?
Paul Elliott, S/V VALIS - Pacific Seacraft 44 #16 - Friday Harbor, WA www.sailvalis.com