UniBond Outdoor Window and Door Frame Sealant Cartridge provides a permanently flexible perimeter seal for exterior window and door frames. Outstanding adhesion to wood, UPVC, polycarbonate and metal. It will not stain sensitive surfaces such as natural stone and marble. It is suitable for Polycarbonate sheet, UPVC, metal, wooden window/door frames, exterior cladding, facia boards, soffits, Draught proofing and insulating. To gain a perfect seal, you must first ensure the area being sealed is clean, dry and free of old sealant, grease and dirt. Furthermore, to make sure that surfaces are as clean as possible, use a cloth damped with white spirit to remove remaining grease and dirt. Using a sealant cartridge and gun: Cut the tip off the cartridge above the screw thread.