Sherpa receives a monthly bottom cleaning year round. Algae, barnacles, and other nasties grow quickly on my bottom in the warm Florida waters. I start to get barnacles on the hull and running gear in less than a month during the summer (I'm using Pettit Trinidad bottom paint). It is amazing how a few barnacles on the prop can drop my WOT RPM and affect performance.
“Go small, go simple, go now”
― Larry Pardey, Cruising in Seraffyn