DAP DynaFlex 800 Window, Door, Siding, and Trim Sealant 10.1 oz. White

DAP Dynaflex 800 is a professional-grade, advanced hybrid polymer sealant formulated for both interior and exterior applications. Its clear, low-odor formula delivers a 100% waterproof and weatherproof seal that stays flexible—resisting cracking, shrinking and crumbling—even under extreme temperature changes. Ready for paint or rain just one hour after application, Dynaflex 800 is ideal for siding, window and door installations as well as general-purpose sealing around trim, flashing and more.

Built to meet ASTM C920, Class 25 standards, this one-tube solution bonds tenaciously to most building materials and can be applied on damp surfaces down to 0 °F. With superior gap-filling ability and lasting adhesion, Dynaflex 800 ensures a durable, visually discreet seal for years of maintenance-free performance.

Key Features

• 100% waterproof, weatherproof seal
• Advanced hybrid polymer formula
• Paint* and rain-ready in just 1 hour
• Superior flexibility & adhesion—won’t crack or crumble
• Meets ASTM C920, Class 25 performance
• Application range: 0 °F to 120 °F
• Maximum gap fill: ½ in.
• Interior & exterior use

⚠️ WARNING: This product can expose you to Silica, crystalline known to the State of California to cause cancer. For more information, visit www.P65Warnings.ca.gov.