Formulated exclusively to deliver excellent performance on exterior wood surfaces, ZAR exterior water-based polyurethane contains UV radiation absorbers and antioxidants. It is the ideal choice for surfaces that would benefit from a clear protective coating. The siding, gables and patio furniture, as well as steel and fiberglass entry doors. Environmentally safe, ZAR exterior water-based polyurethane is the ideal finish for surfaces exposed to direct sunlight and the harsh extremes of weather. The full-bodied formula brushes on like a conventional (oil-based) polyurethane for maximum durability and beauty.