Hello guys, I got a hardwood screen and reocat job ,so I'm ready to appy water base-polyurethane on it after screen,but my friend tolod me ,if there is a Aluminum Oxide coat on the floor ,you can't just screen it out and recoat .My question is how to identify hardwood floor above have the Aluminum Oxide finish ,what does it look like ,How is it visually different from Water Base and oil base polyurethane coat??