Polyken 627-20 Shadowlastic Plus Flashing Tape - PREMIUM 20 MIL Black woven polyethylene backing with aggressive premium butyl rubber adhesive. Applications Used for flashing windows and door installations, corner board abutments, sidewall sheathing seams, and deck-to-wall joints. Suitable for sealing other detail areas against air and water penetration. Excellent bond to a variety of building materials including plywood, OSB, housewrap, concrete, and most metals. Features & Benefits Provides a strong and immediate adhesion even during extremely cold (Service temperature -35F to 200F). Formulated for conformability in both warm and cold weather temperatures. Excellent compatability with most sealants and caulking materials. Easy application - just peel and stick. Resists UV degradation for up to 3 years of direct exposure to sunlight.