The coverage of TotalBoat TotalBuff is hard to specify, but a quart bottle of TotalBuff should have sufficient material to buff the average 40' boat. Factors such as gelcoat condition, freeboard height, beam of the boat, size of the cabin, as well as wasted material from the buffing process will dictate how much TotalBuff it will inevitably require. If the gelcoat is in poor condition, with lots of oxidation and gelcoat porosity, it may only have enough material for a smaller boat.