Mark,
I use International Trilux 33, I believe this is the best rating antifoul in
Australia for aluminium. It is as effective as black board
paint but a lot more expensive! I have a hookah built into the yacht and go over the side every now and then to give the
hull a clean. Thankfully with hard chines I am dealing with flat surfaces. I have discussed aluminium paint products with friends at the
boat yards and all agree that anything associated with paint is the only problem with aluminium. Thankfully I don't mind checking the bottom, so it is something I can live with.