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Polyurethane is a sealant; it keeps water from absorbing into the wood by filling the microscopic pores and grains. If water enters the wood, it can warp and become unstable.

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Q: What is the purpose of polyurethane when finishing lumber?
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Where is polyurethane sold?

Um, the paint store, the hardware store, the lumber yard.


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In a lumber mill, tree trunks are debarked and sawn into planks.it is a big machine that cuts up wood :)


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