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As in the arteries, the walls of veins have three layers, or coats: an inner layer, or tunica intima; a middle layer, or tunica media; and an outer layer, or tunica adventitia. Each coat has a number of sublayers.
How many coats of polyurethane for hardwood floors. Q: Our installer applied three coats of oil-based Duraseal and I would like an additional coat. Our installer did an awesome job but he thinks I am crazy to want another coat of polyurethane. How many coats of polyurethane for hardwood floors are correct? I can see the small indentations in the finish where it has soaked into the grain of the wood.