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PNG,
if you have wax on the floors then you have to sand it off and that is no easy job. The wax will load up the paper and make it a slow process. A good professional barrel sander will do the trick.
Even if there was only urethane on the floors you would still need to resand as urethane is a surface coat and the tung is more penetrating. Urethane is stronger on the surface but the beauty of the waterlox is the depth of color and the ability to recoat with ease in the future.
Is the behr urethane ? what kind of wood ?
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