ESI Tailgate Seal for GMC Sierra & Chevrolet Silverado MultiPro/Multi-Flex — 21ft EPDM Weatherproof Gasket

ESI Ultimate Tailgate Seal is a purpose-built EPDM rubber gasket with factory-grade 3M adhesive that closes the tailgate gaps on GMC Sierra MultiPro and Chevrolet Silverado Multi-Flex tailgates to help keep dust and water out when using a truck bed cap or tonneau cover.

This tailored tailgate seal was designed specifically for modern GMC Sierra (with MultiPro Tailgate) and Chevrolet Silverado (with Multi-Flex Tailgate) models. Manufactured in the USA from automotive-grade EPDM rubber and backed with 3M ST1200 adhesive, it provides a continuous 21-foot weather barrier that bonds to paint, bare metal and most spray-on bed liners. Proper installation and surface prep are important for long-term performance.

How does this seal reduce dust and water intrusion?

The seal forms a continuous, compressive gasket along the tailgate perimeter so airborne dust and rainwater have a much harder path into the bed when a cap or tonneau is fitted. Its dense EPDM profile resists compression set and keeps a tight closure under normal truck movement and vibration.

• 21 feet of automotive-grade EPDM rubber for full perimeter sealing
• Continuous profile that compresses to fill tailgate gaps
• Maintains flexibility across temperature ranges typical for truck use

Will it stick to my truck’s finish and bed liner?

Yes—ESI uses 3M ST1200 double-sided tape formulated for automotive surfaces, so the seal adheres to painted steel, aluminum and most spray-on bed liners. For a durable bond you need correct surface prep and installation pressure.

• 3M ST1200 adhesive bonds to paint, bare metal and spray-on liners
• Apply between 55°–104°F (13°–40°C) for optimal adhesion
• Requires about 25 lbs of pressure along the length to fully set

How is the seal installed and what should I watch out for?

Installation follows the packaged or online instructions closely: clean surfaces thoroughly, align the seal, remove adhesive liner gradually and apply steady pressure as you go. Avoid installing at low temperatures and ensure the adhesive gets uniform compression to prevent gaps or lifting.

• Follow included or online directions step-by-step
• Surface and air temps must be 55°–104°F (13°–40°C) during application
• Use consistent pressure (about 25 lbs) along the adhesive for best results

Which truck models is this compatible with?

This kit is the Original and Patented solution made specifically for GMC Sierra models equipped with the MultiPro Tailgate and Chevrolet Silverado models with the Multi-Flex Tailgate. If your pickup has a different tailgate or is an EV/older/newer variant, ESI offers alternate part numbers for the correct fit.

• Direct fit for Sierra with MultiPro and Silverado with Multi-Flex
• Made in the USA from automotive-grade components
• Alternate ESI ASINs available for Silverado EV, older/newer model years and non-MultiFlex/MultiPro tailgates

Who is this for: The ESI Ultimate Tailgate Seal is aimed at truck owners who use a bed cap or tonneau cover and want a robust, factory-grade seal for Sierra and Silverado models with the MultiPro or Multi-Flex tailgates. It’s ideal for owners who value a tidy, weather-resistant bed, prefer a US-made product, and are comfortable following clear installation steps (or having a professional install it). If your truck has a different tailgate configuration, check ESI’s model-specific part references before ordering.