Defy Crystal Clear Extreme Composite Deck Waterproofing Sealer, Gallon an extremely durable clear finish designed to help prevent the return of black stains on composite decks while providing strong protection against water, fungi, and UV radiation. This sealer features zinc nano-particles that effectively block UV rays, which are responsible for color fading, ensuring your deck maintains its vibrant appearance. Application is simple and can be done using a hand brush, deck brush, or paint roller, with cleanup requiring only soap and water. One gallon covers 100 to 150 square feet. For horizontal composite deck surfaces, only a single coat is needed, while natural wood surfaces require two coats with a 15 to 30 minute wait between applications. The sealer dries to the touch within 2 to 6 hours, making it a practical and efficient solution for deck maintenance. Model Number: 300416