Coppercoat is very popular in our marina (on the Missouri River) with the rich owners of big sailboats. It's kind of overkill in my opinion because our fresh water is so clean and our seasons so short that zincs last for five or more years for example. We do get a slime on the hulls that might be a quarter inch thick by the end of a six month season so most boats get powerwashed at haulout, but a garden hose will wash off the bottoms of the Coppercoat boats. And it sure looks pretty.
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