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Illustration: Eric Larsen
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How Much Paint to Buy

Divide the square footage of your wall surfaces by the coverage per gallon listed on the can. Example: A 20-by-23-foot room with an 8-foot ceiling is 688 square feet; 688 ÷ 350 square feet of coverage per can = 2 gallons (make it 4 gallons for two coats).
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