The MFM Window Wrap PowerBond is a self-adhering, waterproofing flashing tape that is constructed of a tough, aluminium, and multi-lay polymer film. It is coated with a patented PowerBond adhesive system that allows the product to be applied in temperatures as low as 25 degrees F, while remaining stable at elevated temperatures. The aggressive adhesive securely bonds the window flange to the exterior wall, and the rubberized asphalt self-seals around nails and other construction fasteners. This flashing tape effectively stops water leaks around windows and doors while reducing outdoor noise and air infiltration. Will not crack or dry-out, Can be used as flashing on the window sill to protect against moisture penetration, flash window flanges to the building wall in new and remodeling construction, or seal around doors, under siding, exterior plaster, sill plates and wall joints, A carton of Window Wrap PowerBond covers 300 sq ft., Has a 15 year warranty