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Get the Right Amount of Paint

Note: The following recommendations are for two coats of paint. All values are approximate

Boat Type Bottom Paint Topside Topside Polyurathane Enamel Waterline Deck
10' Dinghy 1 qt. 1 qt. 1 qt.
14' Outboard 1-2 qt. 1 qt. 1 qt 1 pt.
18' Runabout 2 qt. 1 qt. 2 qt 1 pt.. 1 qt.
20' Sailboat 3 qt. 2 qt. 2 qt 1 pt.. 1 qt.
24' Runabout 3-4 qt. 2 qt. 2 qt 1 pt. 1 qt.
30' Sailboat 1.5 gal. 3 qt 1 gal. 1 pt. 2 qt 2 qt.
32' Cruiser 1.5-2 gal. 3 qt 1 gal. 1 pt. 2 qt 2 qt.
36' Auxiliary 2 gal. 5 qt 2 gal. 1 pt. 1 gal. 3 qt.
40' Cruiser 2.5 gal. 6 qt 2.5 gal. 2 pt. 1.5 gal. 1 gal.
45' Sailboat 3-3.5 gal 8 qt 3 gal. 3 pt. 2 gal. 1 gal.
50' Sportfisher 4+ gal. 8 qt 3 gal. 4 pt. 2.5 gal. 1 gal.
Right Amount of Paint

Another way to determine bottom paint quantity is to estimate the approximate surface area of the hull below the waterline, using the following formula:

Length x Beam x .75 = Approximate Underwater Surface Area in Sq. Ft.

Each paint has a "theoretical coverage" area, but most paints require at least two coats, so you can expect actual coverage to be no greater than half of the theoretical value.