F30 Prop Strut Dezincification

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MarcHudgins
Posts: 19
Joined: Sun May 01, 2022 9:26 am

F30 Prop Strut Dezincification

Post by MarcHudgins »

The PO had anti-foul paint on the prop strut which we just stripped off and discovered what I'd classify as mild dezincification, some pink splotches, no pitting. There is some thought that copper based anti-fouling can do this, but also that the insulating properties of the cutlass bearing could be to blame.

I'm tempted to leave it as is this year with a coat of prop coat and reexamine next near before doing something like adding a zinc to the strut. Does anyone have a similar experience or advice?

Mark K.
Posts: 60
Joined: Sun Jul 31, 2016 4:32 pm

Re: F30 Prop Strut Dezincification

Post by Mark K. »

Look in the bilge where the strut is bolted to the hull. Make sure the grounding wire for the strut is attached and in good shape.

Also, you can check for stray current corrosion when the boat is in the water using one of these tools. You will need your own multi-meter:
https://www.boatzincs.com/corrosion-ref ... specs.html

Here is a link to some really great videos to help you figure out stray current corrosion and a wealth of other useful information on all things boat electrical related:
https://www.pysystems.ca/resources/videos/

Mark K.

MarcHudgins
Posts: 19
Joined: Sun May 01, 2022 9:26 am

Re: F30 Prop Strut Dezincification

Post by MarcHudgins »

Thanks so much for that. I just heard back from Paul Dennis and that was his advice as well. I'll just have to locate where the strut is accessible.

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