Provides superior flexibility and elongation to seal joints up to 2" wide and endures expansion and contraction without cracking or losing its seal. 100% waterproof and weatherproof. 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 trim board. Paintable, easy gunning, smooth tooling and water clean-up. Cured sealant is mold- and mildew-resistant.