One quart will probably get you 4 coats with roll & tip. Don't forget you thin it out until its like water - so it goes a long way. If you go that route, you'll need to get the brushing thinner & activator. Speaking as a shade tree painter, I'll never spray another hull again. Leave the spray to the inside. You can get good results spraying the nonskid with the Awlgrip additives. I recently sprayed my 21' sailboat with one quart and got 3 coats. Do a search and you'll get plenty of advice.
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