But then again you usually have a sodding great sacrificial anode bolted somwhere on the hull
Another one for coppaslip, unless specified otherwise.
I'm talking about the bits that aren't necessarily electrically bonded to the hull - stainless bolts into alloy masts etc.
Anyway, I've used both Coppaslip and Duralac. Duralac is better. When you've used Duralac (or even heard of it), come back to me