At last we apply two coats of commercial grade finish on your floor to protect it. Our finish comes in different sheen levels from matte to gloss and, of course, your choice will be applied. Sand and Refinish an Engineered Hardwood Floor Sanding and refinishing of engineered hardwood floors is more complicated than refinishing a solid wood floor. Engineered wood floors usually consist of a plywood core and a thin wear layer of solid wood adhered to the top of it. If the wrong equipment is used, a sander will sand right through the wear layer and arrive at the plywood layer, effectively rendering your floor useless.