The 3M™ Sealing Tape 8777 is a self-adhesive barrier for use in the construction industry to seal window and door openings against moisture intrusion. The tape has an aggressive acrylic adhesive and thin, proprietary backing.The 3M Sealing Tape 8777 is a self-adhered, waterproof membrane designed for sealing on difficult to stick to surfaces. This product has an acrylic pressure sensitive adhesive that aggressively sticks and maintains adhesion at both lower and higher application temperatures. The proprietary backing seals around hand driven nails and staples to prevent moisture intrusion. This backing is tough, resists punctures and tears, yet it is thin and conformable to fit conveniently into corners. The 3M Sealing Tape 8777 provides a weather-resistant barrier around windows and doors and can adhere when applied in extreme temperatures. Can be installed at temperatures as low as 0F (-18C) and as warm as 120F (49C).