Seems to me there's no 'antifoul fo all' as the same paint can give different results depending on local salinity & climate. We recently lifted our boat which has white Blakes Hard Racing on it; this has the lowest copper content of all the colours due to pigmentation issues; & only had a very small beard with a thin layer of slime - no hard fouling. She was overwintered in the Itchen with a salt & fresh water mix then moved to Plymouth in April. I must admit to whipping a brush round whenever we visit the boat, but that doesn't take long & keeps her looking good. I did consider changing, but having seen underneath have stuck with it. I would however had changed colour to dark blue if the weather had been kinder. On the plus side, wet sanding the hull was easy & gave a good smooth surface which also keeps the build up of layers down. The new coats also went on easily. Time will tell if I made the right choice.