When selecting a hardwood floor, a lot of attention is paid to what kind of floor materials, color, finish and a number of other elements of hardwood floors and their effect on your home. Almost no instructions are provided on how to correctly care for your hardwood floors after they are installed. Hardwood floors are sealed with a polyurethane sealant that gives wood floors their sheen, protection as well as overall longevity. The finish of the floor usually will last around three years, At some point, the floors will start to dull. This is because very small elements are constantly being ground into the finish through everyday use.