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Old 04-11-2018, 07:45   #1
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VC 17 Bottom Paint electrolysis

Put VC17 over primer on a new hull. After first year of use, the VC 17 wore very well except around the two zinc anodes. I need to replace these with magnesium, but have not gotten that accomplished as yet. Any thoughts on the finish to use around these anodes? Thanks in advance.
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Old 04-11-2018, 09:07   #2
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Re: VC 17 Bottom Paint electrolysis

That's pretty severe ! Are you sure you don't have positive voltage leakage to the zinc from the boat's wiring? Possibly a bilge pump wiring broken?

Are all your thruhulls bonded and if so, are they showing similar symptoms?

I installed a sheet of vinyl between zinc and hull on my boat.

The vinyl doesn't need to extend past the zinc, just prevent the zinc from contacting the paint.
The question is not, "Who will let me?"
The question is,"Who is going to stop me?"

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Old 08-11-2018, 07:16   #3
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Re: VC 17 Bottom Paint electrolysis

Wow. I have never seen that. A zinc should erode, not expand through paint. I too would guess electrical stimulation, be it AC or DC.
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