What is the difference between Polyurethane and Urethane Coatings? Polyurethane coatings were invented in the mid-20th century. Plastic resins in liquid form, primarily to protect wood surfaces.

Read on to find out if you can put polyurethane over paint. Can You Put Polyurethane Over Paint? Jay Sanders of Castle Dream Construction says polyurethane can be applied over paint. So ...