For what it is worth I use Micron 66 for my travels. It has lasted 18 mth – about 3,000NM, but could probably last 2 years – 4,000NM.
I seem to think I did get a better coverage with rolling on – one x 4l tin 2 coats all over with a bit more on the bow & rudder. In Bowen at 18mth they sprayed on 4l. In Darwin they used 8l roll on so must be very thick. Let’s hope I can get 2 years out of that with constant moving. I did clean the hull with a soft cloth every month in the fist 3,000NM. In croc country after that so have not cleaned the hull but there was no growth, probably due to constant moving.
Regards, Allan Haddow - Ophelia