P42 Electrolysis issue... where to start?

Jan 1, 2014
180
Hunter 42 Upper Chesapeake
I
This will not solve your problem but may be helpful in preserving you prop zinc. Paint a stripe on the zinc just outside of each of the prop zinc fasteners. In your photos you will see that that area on the prop zinc is considerably corroded exposing the sides of the fasteners and there is a risk of the zinc coming loose. With the painted stripes your prop zinc will then dissolve more evenly and last much longer. I also put two new shaft zincs on every spring because they are cheap and not because they are completely dissolved. I probably get three or four years out of my max prop zincs with the stripes. My zincs are not dissolving as fast as yours. Suggest also that you test your galvanic isolator.
i agree. I used nail polish inside the bolt holes. Doesn’t show well in the picture. That did seem to prevent the zinc from eroding at those locations. In previous years that zinc would have been long gone.