MFM Psx-20 Window Wrap Flashing Tape - Constructed of a tough, aluminized multi-layer polymer film and coated with specially formulated rubberized asphalt, patented Window Wrap stands up to UV rays like no other product. The durable aluminized surface prevents it from stretching during installation and allows it to withstand exposure without degradation for up to 6 months. Flexible and self-sealing around nails, screws, and staples. A release paper protects the asphalt and is removed as the tape is installed. Adheres to prepared substrates of plywood, Osb, masonry, aluminum,vinyl, steel, drywall, insulation board, and house wrap. May also be used as a weather-proof barrier between metal brackets and ACQ lumber. 25 mil.