Professional 4-inch wide sealing tape with waterproof membrane and high-tack acrylic adhesive for difficult-to-stick surfaces. UV-resistant, heat-stable, and ideal for construction and industrial applications.
3M™ Sealing Tape 8777 is a professional-grade translucent sealing tape engineered for demanding construction and industrial applications. Featuring a proprietary film backing with high-tack acrylic adhesive, this self-adhered tape is specifically designed to seal difficult-to-stick surfaces, including damp and moisture-prone areas. The tape measures 4 inches wide by 75 feet long and comes in a case of 12 rolls with a convenient split liner for fast and accurate application.
This innovative sealing solution provides exceptional performance in extreme temperature conditions, with UV resistance lasting up to 12 months and adhesive that will not melt or stain when exposed to heat. The waterproof membrane creates a robust moisture barrier while the aggressive acrylic adhesive maintains superior adhesion at both low temperatures (-40°F/-18°C) and high temperatures (150°F/66°C). The tough yet conformable backing resists punctures and tears during application while remaining thin enough to fit conveniently into corners and tight spaces.
Ideal for deck joist and header board sealing, window and door opening seals, and exterior side panel applications, 3M Sealing Tape 8777 delivers a reliable, durable solution for professional contractors, builders, and industrial users. The product is manufactured with a 24-month shelf life from the date of manufacture and is intended for industrial and occupational use only, meeting the demanding standards of construction, automotive, marine, and general industrial applications.
Key Features
- Self-adhered tape design for sealing difficult-to-stick surfaces, including damp surfaces
- UV-resistant for up to 12 months with adhesive that does not melt or stain when exposed to heat
- Waterproof membrane that produces an effective moisture barrier and air seal
- Tough backing resists punctures and tears during application while remaining thin and conformable
- Aggressive acrylic adhesive stays stuck at both low (-40°F) and high (150°F) application temperatures
- Split release liner offers fast application with easy and accurate positioning
- Compatible with many building sealants for enhanced performance
- Proprietary film backing for superior durability and conformability
Technical Specifications
| Specification |
Value |
| Product Number | 8777 |
| 3M ID | 7100030068 |
| UPC | 00051111928738 |
| Overall Width | 4 inches (101.6 mm) |
| Overall Length | 75 feet (22.86 m) |
| Overall Thickness | 9.9 mil |
| Backing Thickness | 5 mil (0.13 mm) |
| Adhesive Thickness | 0.13 mm |
| Product Color | Tan |
| Product Form | Roll |
| Units per Case | 12 rolls |
| Adhesive Material | Acrylic |
| Backing Material | Proprietary Film |
| Primary Liner | Heavy Paper Split |
| Adhesion Strength | 60 oz/in (66 N/100mm) |
| Elongation | 7% |
| Minimum Operating Temperature | -40°F (-40°C) |
| Maximum Operating Temperature | 176°F (80°C) |
| Application Temperature Range | 0°F to 150°F (-18°C to 66°C) |
| UV Resistance | Up to 12 months |
| Shelf Life | 24 months from date of manufacture |
| Primary Application | Exterior Side Panel Sealing |
| Brand | 3M™ |
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