303 High Tech Fabric Guard restores lasting water repellency to marine canvas. It stops leaks, protects against soiling and both water and oil based stains, and resists mildew formation and UV sun damage. Spray on, let it dry. Every 16 oz bottle treats 50-75 sq. ft. of marine canvas. This is also your best choice for fabric upholstery, carpeting and breathable wet weather gear.