Recommended by & for Sunbrella/Glen Raven Mills, Inc. Restores lasting water repellency to marine canvas. It stops leaks, protects against soiling and both water & oil based stains, and resists mildew formation and UV sun damage. Spray on, let dry. 16 oz. trigger sprayer treats 75-100 sq. ft. of marine canvas. 303 HTFG is also your best choice for fabric upholstery, carpeting & breathable wet weather gear.