It depends on the kind of paint it can veri from 39 ft to 50 ft if used right
Improved Answer: Even a high build elastomeric paint goes 80 square feet a gallon. A standard gallon of paint has a theoretical coverage rate of 400 sq ft. However, this amount will be reduced on a porous or textured surface as much as half.
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About 1500 sq ft
To answer this question, you need to know how much a gallon or unit of the paint can cover and the price per gallon or unit of the paint. Let us say a gallon covers 120 sq ft and it costs 10 dollars a gallon. You would need 600/120 gallons, which is five gallons and it would cost 5 x 10 dollars, which is fifty dollars. This is just an example, not an estimate. The other cost would be labor if you hired someone to do it. Otherwise you would also have to add the cost of a paint roller and pan, and brushes if you did it yourself.
One gallon covers 400 sq ft on a smooth surface one coat. For rougher surface, much less per gallon, 200-300 sq ft oer coat. One gallon costs between $20-$50 depending on quality.
6 and 2/3 gal.
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