Professional-grade sealing tape with waterproof membrane and UV resistance for difficult-to-stick surfaces, damp conditions, and extreme temperature applications in construction and industrial use.
3M™ Sealing Tape 8777 is a premium translucent sealing tape engineered with a proprietary film backing and high-tack acrylic adhesive specifically designed for difficult-to-stick surfaces, including damp surfaces. This self-adhered tape features a waterproof membrane that creates an effective moisture barrier while providing an air barrier for comprehensive sealing solutions. The tape is UV-resistant for up to 12 months and the aggressive acrylic adhesive will not melt or stain when exposed to heat, making it ideal for exterior applications in extreme temperature environments.
The innovative design includes a tough, puncture-resistant backing that remains thin and conformable, allowing it to fit conveniently into corners and tight spaces without compromising performance. The split release liner enables fast application with easy and accurate positioning, while the high-tack adhesive maintains aggressive adhesion at both low and high application temperatures ranging from -18°C to 66°C. This professional-grade tape is engineered to seal around nails and staples, preventing moisture intrusion and establishing reliable air barriers for construction and industrial applications.
The 3M™ Sealing Tape 8777 is available in a convenient 60-inch width by 75-foot length roll format, providing ample coverage for large-scale sealing projects. Recommended for deck joist and header board sealing, window and door opening seals against moisture intrusion, and various exterior side panel applications. This product is compatible with many building sealants and meets the demanding requirements of professional contractors, builders, and industrial users who require dependable, long-lasting sealing solutions.
Key Features
- Self-adhered design specifically engineered for difficult-to-stick surfaces including damp surfaces
- UV-resistant for up to 12 months with heat-resistant adhesive that will not melt or stain
- Waterproof membrane creates effective moisture barrier and air barrier for comprehensive sealing
- Thin, conformable backing resists punctures and tears while fitting conveniently into corners
- Split release liner enables fast application with easy and accurate tape positioning
- Aggressive acrylic adhesive maintains strong adhesion at low and high application temperatures
- Compatible with many building sealants for versatile construction applications
- Seals around nails and staples to prevent moisture intrusion effectively
Technical Specifications
| Specification |
Value |
| Product Number | 3M 8777 |
| UPC Code | 00076308867409 |
| 3M ID | 7010415511 |
| Overall Width (Imperial) | 60 inches |
| Overall Width (Metric) | 1,524 mm |
| Overall Length (Imperial) | 75 feet |
| Overall Length (Metric) | 22.86 meters |
| Product Color | Tan |
| Backing Material | Proprietary Film |
| Adhesive Material | Acrylic |
| Backing Thickness (Imperial) | 5 mil |
| Backing Thickness (Metric) | 0.13 mm |
| Adhesive Thickness (Metric) | 0.13 mm |
| Adhesion Strength (Imperial) | 60 oz/in |
| Adhesion Strength (Metric) | 66 N/100mm |
| Elongation | 7% |
| Primary Liner | Heavy Paper Split |
| Minimum Operating Temperature (Fahrenheit) | -40°F |
| Minimum Operating Temperature (Celsius) | -18°C |
| Maximum Operating Temperature (Fahrenheit) | 176°F |
| Maximum Operating Temperature (Celsius) | 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 |
| Product Form | Roll |
| Quantity per Case | 1 roll |
| Brand | 3M™ |
| Primary Application | Exterior Side Panel Sealing |
| Industries | Appliance, Automotive, Construction, General Industrial, Marine, Metalworking, Military, Paper, Print, Transportation, Woodworking |
| Recommended Uses | Deck joist and header board sealing, window and door opening seals against moisture intrusion |
| Use Classification | For industrial/occupational use only. Not for consumer sale or use. |
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