Antifouling recommendations

I too have 'proper' coppercoat and it IS fantastic. I've nerver heard that it needs to have a light repaint to keep it active, that's just rubbish.
I'm into my 5th season and can't fault it.

Coppercoat's web sites says

What maintenance is necessary?

Correctly applied Coppercoat will continue to deter marine fouling for many years. The annual chore of repainting associated with conventional anti-foulings is no longer necessary. If, over the months, a slight accumulation of slime does appear, this can be removed by pressure washing or brushing. An annual wash or brush is recommended. Eventually, usually after several years, the surface may benefit from being lightly abraded with a fine grade of “wet and dry” paper or a burnishing pad to expose fresh copper.
 
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