Premium elastomeric "Silicone Tough" latex formulation delivers outstanding performance against the elements. 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. It has 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.