Join Date: Nov 2009
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Re: Propeller pitting
One year my MaxProp zinc had disappeared, along with the screws and the blades were badly pitted--though not as bad as the OP's. PYI recommended "plating" the blades with the original bronze formulation and remachining the blades to the original design. They also tightened up the play and returned the prop looking like new. That was a number of years ago. They charged about $900, if memory serves, but that was less than the $2000+ cost of a new prop.
Since then, I have used Pettit Barnacle Buster zinc spray on the prop and shaft, with excellent results. The attached thumbnail shows the prop after haul-out this fall. The bottom and prop were power-washed by the boat yard, with no other treatment of the prop.
BTW, my boat is not at a marina and shore power is rarely connected, so the original problem--only once in 20 yrs, is a mystery.