I have tried many, many products including Prop-Speed....all with marginal results. When I hauled two years ago, On a whim, I smeared Tef-Gel on my prop and shaft (can't wash it off your hands) After recently diving
to check the bottom and running gear
, I have some slime from sitting at the dock
...virtually no growth...Admittedly I have not been using my boat much due to refit
so I don't know how it will hold up under severe use, for now it seems promising...