For what its worth..
I have just had my boat out at the landing for 2 weeks . Had coppercoat but after much deliberation I sanded it mostly off, applied 2 coats of primacon and 2 coats of grey warpaint. Boat looks great for now. See how Warpaint performs in OBC. The coppercoat was 10 years old but in the last 3 years I was cleaning it 2-4 weekly. Never seemed to get it really clean.