Professional-grade 3M sealing tape with waterproof membrane, UV resistance, and high-tack acrylic adhesive for difficult-to-stick surfaces including damp areas. 6 inches wide, 75 feet long per roll, 8 rolls per case.
3M™ Sealing Tape 8777 is a premium translucent sealing solution engineered with a proprietary film backing and high-tack acrylic adhesive on a split liner. This self-adhered tape is specifically designed for sealing difficult-to-stick surfaces, including damp surfaces that challenge conventional adhesive tapes. The tape features a waterproof membrane that creates a reliable moisture barrier while establishing an air seal around critical building penetrations such as nails and staples. With UV resistance for up to 12 months and adhesive formulation that will not melt or stain when exposed to heat, this tape delivers exceptional durability in extreme temperature environments ranging from -40°F to 176°F.
The innovative backing of 3M™ Sealing Tape 8777 combines toughness with conformability, resisting punctures and tears during application while remaining thin enough to fit conveniently into corners and tight spaces. The aggressive acrylic pressure-sensitive adhesive maintains superior bond strength across a wide temperature range (0°F to 150°F), ensuring reliable performance in both cold and hot climates. The split release liner enables fast, accurate positioning and simple application, making installation efficient for professional contractors and builders. This tape is compatible with many building sealants and is recommended for deck joist and header board sealing, as well as window and door opening seals against moisture intrusion.
Available in a convenient 8-roll case with 6-inch width and 75-foot length per roll, this industrial-grade sealing tape provides a cost-effective solution for demanding construction and building envelope applications. The product is manufactured by 3M, a trusted leader in adhesive technology and industrial solutions, and is intended for professional industrial and occupational use only. With a 24-month shelf life and proven performance in appliance, automotive, construction, marine, and woodworking industries, 3M™ Sealing Tape 8777 represents the pinnacle of sealing tape innovation.
Key Features
- Self-adhered tape design specifically engineered for sealing difficult-to-stick surfaces and damp surfaces
- UV-resistant for up to 12 months with adhesive that does not melt or stain when exposed to heat
- Features waterproof membrane that produces reliable moisture barrier and air seal
- Tough, puncture and tear-resistant backing that is thin and conformable for corner fitting
- Split release liner enables fast application with easy and accurate positioning
- Aggressive acrylic adhesive maintains superior bond at both low and high application temperatures (-40°F to 176°F)
- Compatible with many building sealants and suitable for deck and window sealing applications
- Professional industrial-grade quality from 3M with 24-month shelf life
Technical Specifications
| Specification |
Value |
| Product Number | 3M 8777 |
| 3M ID | 7010337884 |
| UPC Code | 00076308141820 |
| Product Color | Tan |
| Overall Width (Imperial) | 6 inches |
| Overall Width (Metric) | 152.4 mm |
| Overall Length (Imperial) | 75 feet |
| Overall Length (Metric) | 22.86 meters |
| Rolls Per Case | 8 rolls |
| Adhesive Material | High-tack acrylic |
| Backing Material | Proprietary film |
| Backing Thickness (Imperial) | 5 mil |
| Backing Thickness (Metric) | 0.13 mm |
| Adhesive Thickness (Metric) | 0.13 mm |
| Primary Liner | Heavy paper split liner |
| Adhesion Strength (Imperial) | 60 oz/in |
| Adhesion Strength (Metric) | 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 |
| Product Form | Roll |
| Primary Application | Exterior side panel sealing |
| Brand | 3M™ |
| Industries | Appliance, Automotive, Construction, General Industrial, Marine, Metalworking, Military, Paper, Print, Transportation, Woodworking |
| Product Type | Waterproof sealing tape with moisture barrier |
| Use Type | Industrial/occupational use only |
| Recommended Applications | Deck joist and header board sealing, window and door opening sealing against moisture intrusion |
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