When you say aluminum antifouling, do you mean to say antifouling for aluminum boats? Because that would mean a paint
that is very effective, but denied to those of us with hulls other than aluminum. Tributyl tin oxide (TBTO) is a very powerful and effective antifouling agent, tremendously toxic to marine
growth, but one which doesn't attack the aluminum substrate. We used to be able to buy one ounce bottles of it to add to our conventional bottom paint
here in San Diego
. But no longer.