303 Fabric Guard is the only product recommended by and for Sunbrella, as well as other fabric manufacturers to restore lost water repellency to fabrics. Resist water, even when youre on the water. 303 Fabric Guard creates a powerful shield to greatly increase water and stain repllency, protecting against both oil and water based stains. Spray it on fabric seats, boat covers, awnings, Dacron sails, etc. Keep all your favorite fabrics crisp and clean for years to come.