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My old man uses the Blue Water paint on one of his towboats, which is an aluminum hull inflatable. Of course the variety we use on this boat is aluminum compatible, but it's always held up really well, and all four of our towboats are in from April to November 31, so you could say they're seeing a full season's use.
As far as adding copper, the active ingredient in copper-based paints is actually cuprous oxide, which to copper is the equivalent of rust on iron, or ferrous oxide. Most single season paints have anywhere from 20% to 30% cuprous oxide, with some multi-season paints sporting 35% to 45%. Pettit Trinidad has 60%, but it carries a price tag to show it. Obviously the higher the cuprous oxide the better the paint, but you can count on paying a higher price, especially if a secondary biocide like irgarol is included, which essentially increases effectiveness.
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