DAP DYNAFLEX 230 PREMIUM 100% WATERPROOF INDOOR/OUTDOOR ELASTOMERIC SEALANT model 7079818286 Provides superior flexibility and elongation to seal joints up to 2" wide and endure expansion and contraction without cracking or losing its seal. 100% waterproof and weather proof. Won't crack, crumble or chalk. Excellent adhesion to a wide range of building materials including wood, MDF, fiber cement, vinyl, aluminum, PVC polystyrene and composite trimboard. Paintable, easy gunning, smooth tooling and water clean-up. Cured sealant is mold and mildew resistant. Meets ASTM C920, Class 25. 10. 1 ⚠ WARNING: This product can expose you to chemicals known to the State of California to cause cancer. For more information, go to: www. P65Warnings. ca. gov. DAP DYNAFLEX 230 PREMIUM 100% WATERPROOF INDOOR/OUTDOOR ELASTOMERIC SEALANT has elastomeric "Silicone Tough" latex formulation which delivers outstanding performance against the elements.