In the Bay Area, I have only ever seen two running gear anti fouling
solutions that I would recommend to a customer:
1.- Prop Speed, which is great against both hard and soft fouling (IMHO) but also expensive and difficult to apply.
2.- Pettit Zinc Coat Barnacle Barrier, which is cheap
and easy, but mostly effective against shelled animal fouling (like barnacles) which are not typically a big issue for most boats here in the Bay.
I have never seen any other store-bought or home-made running gear anti fouling
coating that worked worth a damn, and that includes anti fouling paint