Join Date: Feb 2010
Location: Narragansett Bay
Thanked 217 Times in 202 Posts
Rep Power: 7
All boats with dissimilar metals in an electrolyte need protection, even in fresh water. I assume you haven't seen any external electrolysis, but it can occur where you can't see it as well. However, salt water is a much better conductor and more important to have a zinc attached to your shaft and/or prop, assuming you have an inboard.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.