In my 14 years of boat ownership and keeping it in a slip, I've tried several bottom paints. Interlux ACT, Pettit and Woolsey are ones I can recall. None were really effective, to my satisfaction.
This past year, on the recommendation of a fiber glass mechanic, who also paints boats, I used Interlux Micron Extra. That is an outstanding paint. For the first time in those 14 years, I pulled my boat and did not find one barnicle on the painted area of my boat.
I called him, thanked him and told him of my experience. He went on to tell me other paints are fine for southern waters but Micron Extra is the paint for the Delaware Bay and northern areas.
This past year, on the recommendation of a fiber glass mechanic, who also paints boats, I used Interlux Micron Extra. That is an outstanding paint. For the first time in those 14 years, I pulled my boat and did not find one barnicle on the painted area of my boat.