Hi Stewart.
I Have Copper Coat On My P-27.Grey Seal,I Applied It About Four Years Ago.I Also Keep My Boat On A Mud Mooring Where It Sits On The Mud At Low Springs And In Strong Westerlies.I Have Had Very Poor Results With Large Amounts Of Fouling From Barnacles.I Usually Have To Clean Bottom Mid Season.I Spoke To Suppliers And They Suggested a Light Sanding Before Putting Boat In Water Each Year,I Tried This Without Success,Next Season I Will Re coat With Anti fouling.
Regards,Tom Fitzgerald.