Boat Bottom Paint Calculator
Boat Bottom Paint
Calculate how much antifouling bottom paint you need based on boat dimensions and number of coats, plus estimated material cost.
Formula
Hull Surface Area = Waterline Length x (Beam + Draft) x 0.85; Total Coverage Area = Hull Area x Number of Coats; Gallons Needed = Total Coverage Area / 350 sq ft per gallon
Frequently Asked Questions
How often should I repaint the bottom of my boat?
Most antifouling paints last one to two seasons depending on water temperature, salinity, and how often the boat is used. Boats kept in warm saltwater may need annual repainting.
How many coats of bottom paint do I need?
Two coats are standard for most applications. Apply three coats on the waterline area and any leading edges that experience more wear. New boats or bare hulls may need a primer coat first.
What type of bottom paint should I use?
Ablative paint wears away slowly and is ideal for boats used regularly. Hard modified epoxy paint is better for high-speed boats. Consult your marina for local environmental regulations on copper content.