cavitation on aluminium props.

Fair enough, but if its just the anti foul coming off probably no big deal, I have antifouled them in the past and it always comes off at the root area similar to yours and thats even when only doing 5knts on the river :)
Rodders has done 2 seasons with no AF win win trail boating , But are u not supposed to put the boat in the water.
 
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