How to install a weatherstrip on the trunk of a mustang

Written by thomas west
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How to install a weatherstrip on the trunk of a mustang
Seal your Mustang's boot lid by replacing the boot weatherstrip. (mustang gt tail light image by Jorge Moro from

The Mustang is a sporty two-door car that comes in coupe or convertible form. Longitudinally-mounted six or eight cylinder engines drive the rear wheels through a solid rear axle. Compared to other cars, the Mustang has a small luggage area that is accessed by opening a boot lid at the rear of the car. The boot lid is sealed against the elements with a rubber seal. Over time the seal may become compressed or brittle, allowing air or water to enter the boot area.

Skill level:

Things you need

  • Plastic putty knife
  • Rag (optional)
  • Acetone (optional)
  • Fine sandpaper
  • Weatherstrip adhesive
  • Utility knife

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  1. 1

    Open the boot lid. Pull the existing weatherstrip from the underside of the boot lid downwards. Discard the weatherstrip once it has been removed from the lid.

  2. 2

    Scrape any remnants of weatherstrip or adhesive from the underside of the boot lid were the weatherstrip resided with a plastic putty knife. Further clean the area with a rag soaked in acetone, if necessary.

  3. 3

    Prepare the underside of the boot for adhesion by lightly sanding the area where the new weatherstrip will be installed with fine sandpaper. Do not sand beyond where the weatherstrip will reside, as this will dull the paint.

  4. 4

    Apply a coat of weatherstrip adhesive to the underside of the boot where the weatherstrip will be installed with a finger. Allow the adhesive to dry until it is slightly tacky to the touch. Apply a coat of adhesive to the underside of the new boot weatherstrip in the same fashion.

  5. 5

    Use the area directly behind the boot latch as a starting point for the weatherstrip and start pressing it into place. Work your way around the entire circumference of the underside of the boot lid, pressing the weatherstrip into place as you go.

  6. 6

    Cut any excess length of weatherstrip off with a sharp utility knife, but do not cut off too much. Make sure both ends meet behind the boot latch with no gaps in between. Close the boot lid and allow the adhesive to dry or cure as per the instructions on the adhesive container.

Tips and warnings

  • After replacing the boot weatherstrip, the boot lid may take a little more effort to close than what you are used to. The new weatherstrip is probably thicker than the old weatherstrip you removed, but more effective at sealing the boot lid to the car body.

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