Wear Layer Thickness and How Many Refinishes You Get
The wear layer is the real hardwood on top. It decides how many times the floor can be sanded, and it is the number retailers mention least.
Budget boards run 0.6 to 1 mm, which cannot be sanded at all. Quality boards run 3 to 6 mm, which gives two to four full refinishes and a floor that can last as long as solid.