I called Petit and ask their tech people to recemend a product for coating my bronze prop. Without hesitation they said Zinc Coat Barnacle Barrier.
It's only been on my prop for just less than two months, but it's still there. Most bottom paints I've tried are gone by now. I'm in the Florida Keys and fowling is terrible. So far so good, and it's very easy to put on. Time will tell!