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Last year this was a major issue. So scraped then hand sanded down to automotive paper. Then two coats petits spray and two coats very thin layers of petits water soluable bottom paint. Works so far. Boat is run near daily for a week or two. Then sits for about a week ten days. In marina on slip with out much current.
Big disadvantage to prop speed is need to get back to bare metal before each reapplication and expense. See variation in effectiveness if done by yard or owner. Petits spray seems idiot proof- just right for me trying to DIY as much as possible.