How to install a Tailgate Seal with Taper Seal®

ITEMS REQUIRED: Scissors, clean rag and soap solution.
Extreme temperatures will result in poor adhesive performance. Apply only if air and surface temperature is between 55° - 105°F (13° - 40°C). Avoid touching adhesive after peeling off red liner.

Repositioning of seal should not be done more than 3 times and only once if the temperature is above 80°F (13°C)

Click on photo for an enlarged view

2015 and newer GMC Canyon


Clean area thoroughly with soap and water solution and wipe completely dry. Use alcohol pad to prep the tape application area and let dry. Wait until after STEP 6 to apply very firm pressure to secure adhesive bond for the sidewalls. If necessary, seal can be removed and repositioned for the sidewalls only, not the tailgate gap, prior to STEP 7. Pictures shown below are for the left sidewall and tailgate gap.


Start 1” (2.5cm) below truck bed floor and attach seal to the rear corner edge of the left sidewall extension (FIG 2A). When nearing top of sidewall, gradually rotate seal 90° counter clockwise so that bulb is facing inward and the taped side of seal is flush with the sidewall at the top (FIG 2B). Cut to fit. Apply light pressure to adhesive. Duplicate for right sidewall.


Cut and attach a 2.75" piece from the Large Tailgate Seal and attach just below top of bedrail (FIG 3A.  Flush to the seal on the sidewall extension, bulb side facing inwards. Do not attach adhesive to seal.  Apply light pressure to adhesive. Check that the top of the tailgate does not interfere with the top of seal by lifting up tailgate (but not closing)  and inspecting from the outside rear. Adjust seal as necessary. Duplicate for right sidewall.

Alternate view


Cut a 3" (7.62cm) piece from the Large Tailgate Seal and attach to the side of tailgate near the top, bulb side facing down (FIG 4A). Apply light pressure. Duplicate for right side.  


One minute help video available at  

To evaluate the best positioning for the tailgate gap, cut a 1” (2.5cm) test piece and align the top of bulb with the truck bed floor. Stand to the side of truck and raise tailgate until bulb makes contact with tailgate. 

NOTE: Compression and/or slight rolling of the bulb is okay, however, if the bulb rolls downwards too much as the tailgate is closing and you can see the tape, then seal has rolled too much. This can cause added stress on the adhesive and possible separation. 

If you see that the bulb is rolling too much when tailgate is closing, then invert 1” test piece so that bulb side is down. Raise tailgate and make sure no light is visible through the 1” piece. Adjust 1” piece higher or lower to seal out the light. After determining if the bulb should be up or down and how high or low, remove 1” piece and pick up one end of the continuous seal. 

Start at either end, peel back a section of liner and flush to seal on the sidewall. Attach in sections and apply light pressure to adhesive, should you need to reposition. Flush to seal on the other sidewall and cut to fit. Apply very firm pressure to secure adhesive bond. 

Alternate view


Close tailgate. If you see light through the sidewalls, make adjustments by removing the seal and repositioning. If there is still light, then cut pieces of seal as needed and attach to sidewalls and/or tailgate. Do not attach adhesive to seal. Open tailgate.


After Tailgate Seal is in place, apply very firm pressure to secure the entire adhesive bond. Leave tailgate open for 30 minutes. If the air tempreture will fall below 50°F (10°C) within the next 24 hours or, if applying to a surface other than paint, such as plastic or a sprayon bed liner, then leave tailgate open for 24 hours.

Inside view showing left side of tailgate when closed
Due to the variety of truck designs the application of Tailgate Seal with Taper Seal® may vary slightly.
       Taper Seal® is a registered trademark of Extruded Solutions, Inc.
	   U.S. Patent #10,099,544