Here are some pictures of a boat we cleaned recently. As you can see, no calcium ring deposits. This boat hasn’t been painted for 5 years. No electrolysis showing because we kept up on zincs and no hole pitting in the props due to calcium rings burning holes in the brass. By the way, this happens when you run your boat a high RPM’s and air is trapped behind them causing a melting effect.
Boat Hull Cleaning July 2016