Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Adhesive Installation of Quarter Windows
- Use a urethane adhesive systems which meet GM Specification GM 3651G
- Remove all mounds or loose pieces of urethane adhesive from the pinchweld area.
- If the original window is being reused, remove all but approximately 2 mm (3/64 in) of the existing bead of urethane adhesive from the pinchweld flange by using a clean utility knife or razor blade scraper.
- Inspect for any of the following problems in order to help prevent future breakage of the window:
- The flange of the window opening
- High weld
- Solder spots
- Hardened sealer
- Any other obstruction or irregularity in the pinchweld flange
- After repairing the opening as indicated, perform the following steps:
- Use an abrasive pad if necessary to remove mold release buildup from the encapsulated window. Use a dampened lint free cloth to remove any debris remaining on the window.
- Dry fit the window to the opening in order to determine the correct position.
- Ensure that the window locator pins are positioned to the pinch-weld flange.
- Use masking tape to mark the locations of the window in the opening.
- Cut the masking in the center and remove the window from the opening.
- Verify all primers and urethane adhesive are within expiration dates.
Refer to Glass and Sheet Metal Handling Warning .
If corrosion of the pinch-weld flange is present or if sheet metal repairs or replacements are required, the pinch-weld flange must be refinished in order to restore the bonding area strength. If paint repairs are required, mask the flange bonding area prior to applying the color coat in order to provide a clean primer only surface. Materials such as BASF DE15®, DuPont 2610®, Sherwin-Williams PSE 4600 and NP70® and Martin-Semour 5120 and 5130® PPG DP90LF SPIES/HECKER 3688/8590 - 3688/5150 - 4070/5090 STANDOX 11158/13320 - 14653/14980 products are approved for this application.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.