Fwiw, most recommendation is 4 days max in the ocean without bottom coat. Powerboat-Reports says a week. PBR does comprehensive testing of bottom coats; Id go with their recommendation.<br /><br />So if you will be doing outings with your boat in the water for a week or so at a time, you may want to consider bottom coat. Otherwise, as was mentioned above, boats on trailers dont benefit from bottom coating.