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Old 02-03-2017, 01:23 PM   #12
Xsbank
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City: Pender Harbour, BC
Country: Canada
Vessel Name: Gwaii Haanas
Vessel Model: Custom Aluminum 52
Join Date: Sep 2013
Posts: 3,356
The reason shaft zincs fail prematurely is because the area where the clamping screws go is thin compared to the bulk of the zinc. If you paint around the area where the mounting screws go, it will inhibit the deterioration of the material in that area and they will last a lot longer before being flung off by the spinning shaft. This is what I do and it has lasted three years. Just installed (nothing else painted!):
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