Which antifouling bottom paint should I use for an aluminum hull or sterndrive?

You never want to use a bottom paint containing cuprous oxide on aluminum hulls, parts, or underwater metals because doing so will cause galvanic corrosion, which will destroy aluminum and other metals.

Instead, choose an antifouling paint that contains zinc (to combat slime), and either cuprous thiocyanate or the non-metallic, copper-free biocide known as Econea® (tralopyril).

Suitable bottom paints for aluminum hulls and outdrives include TotalBoat AlumiPaint AF, Pettit Ultima ECO, Pettit Hydrocoat ECO, Interlux Pacific Plus, Interlux Micron CF, Sea Hawk Smart Solution, and TotalBoat Outdrive AF.