FWIW, as I have mentioned in other articles...
I installed three coats of WM brand ablative that was on sale in 2004. A few weeks ago I had a diver check the status of the hull to determine whether to haul and repaint this season. The diver told me that if it were his boat she would be good for another season. He scrapped a few barnacles off the prop and a thin layer of mussels from the keel. Other than that he said the hull just had a fine amount of fuzz, which comes off with each sail.We keep our boat in sea water year around. I've been very happy with the performance of WM brand ablative paint. I would recommend it to anyone looking for a good quality bottom paint. Next year I plan to use the same paint again when I redo the hull.Terry