Zinc ointment
his sounds like the zinc oxide ointment (diaper rash ointment) craze of a couple of years ago. Myself, I used teflon grease. They all work until they wear off, sooner rather than later. In a bonded system with zincs, nothing works. Even anti-fouling paint doesn't work. The barnacles eat it for lunch and grow on top of it. Trouble is with bonding and zincs, no copper ions escape the surface of the metal or the paint, for that matter. Last year the bonding wire to the strut was not conected and we had no barnacles on the strut. However, the surface of the strut started to turn pink and that ain't good. this year the wire was connected and we had the usual crop of sea life on shaft, prop and strut -- except where the zincs had been. I put a donut zinc on the shaft between the prop and the strut. This seems to greatly reduce barnacle buikldup on the prop.
