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Depending on the poly, the wood as well as the condition and the age of the wood, figure a minimum of 300 - 500 square feet per gallon. If the floor is very old or dry, it will be closer to the 300. If the wood is in good condition and reasonably new, 500 is a reasonable assumption. Also, with each coat you put on, the poly will last longer once a foundation coat is established.

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Q: How many square feet does one gallon of polyurethane cover?
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