Extra heavy duty hard finish acrylic was costs more than our regular acrylic because it contains about 30 percent more of the costly ingredients. For the extra cost the home owner will get with one coat the equivalent of two coats of any other floor wax product on the market. That means 3-4 times the more wear. It is black mark resistant, scuff proof and easy to remove but most importantly it dries with a brilliance worthy of it name super gloss.