Permanently flexible: UniBond waterproof sealant provides a durable flexible perimeter seal for exterior window and door frames, protecting you from the elements Multi materials: This durable adhesive sealant can be used on various materials such as wood, uPVC, polycarbonate, and metal: suitable for most window and door frames Flexible and waterproof: As well as providing strong and flexible sealing, this window frame sealant is also waterproof, so it can stand up to harsh weather conditions 25-year guarantee: As long as you follow the instructions for use, this exterior sealant is covered by a quarter-century guarantee: we're confident in its durability Package contents: UniBond Outdoor Window and Door Frame Sealant, weather-resistant silicone sealant, flexible and long-lasting waterproof sealant, white, Cartridge