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 you’re on the water. 303 Fabric Guard creates a powerful shield to greatly increase repellency and protect against oil and water- based stains. Spray it on fabric boat covers, awnings, Dacron sails and more! When applied to clean and dry fabrics, 303 Fabric Guard restores lost water and stain repellency to straight-from-the-factory levels.