I have an Ameron product on my tub though I don't remember exactly which one. I put on two coats over three years ago and just now need to clean the bottom, slime only. This formula is 70% copper, vinyl based paint if that is any help.
I've used it for about 10 years and like it just fine however I haul my boat every fall so can't speak to longevity. I do get a couple summer seasons out of a coating of paint. Boat comes out clean.