Fabric protectant is formulated with PTEF, a protective polymer, barrier coating to restore water repellency to all outdoor fabrics. PTEF polymers also help repel UV rays that cause fading. If surface to be treated is dirty or stained, clean with Outdoor Collection Heavy-Duty Fabric Cleaner. Once fabric has dried, apply Water Repellent with sprayer, brush, or sponge spreading evenly to thoroughly wet surface. Repellent helps prevent mildew stains and does not change the feel or breathability of fabric.