Figuring out the approximate surface area (in square feet) of your hull below the waterline is a good way to determine the amount of bottom paint you’ll need. Try the TotalBoat bottom paint calculator or use this easy formula:
Length x Beam x 0.85
How heavily you apply the bottom paint is another factor in determining the quantity. The amounts below assume you want to coat the surface as thickly as possible without causing runs, and that you are applying two coats. For specific quantities, always refer to the manufacturer’s details on coverage areas.
| Type of Boat | Bottom Paint |
|---|---|
| 14′ outboard | 1-2 quarts |
| 18′ runabout | 2 quarts |
| 20′ sailboat | 3 quarts |
| 24′ runabout | 3-4 quarts |
| 30′ sailboat | 1.5 gallons |
| 32′ cruiser | 1.5-2 gallons |
| 36′ auxiliary | 2 gallons |
| 40′ sailboat | 2.5 gallons |
| 45′ sailboat | 3-3.5 gallons |
| 50′ sportfisher | 4+ gallons |
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