Re: SF Bay - how long do you get out of Pettit Trinidad SR?
We had our boat in Sausalito for 10 years. IIRC we used 2 coats of blue Petit Trinidad about every 2 years. Although we didn't race, speed was a concern as we used to make the long run outside to Duxburry every week during salmon season.
Around the beginning of the 2nd year we would start to get some growth around and just below the water line, which we could remove with a long handle brush. If you are in the South Bay the water may be warmer than in Sausalito?