- Remove all mounds or loose pieces of urethane adhesive from the pinch-weld area.
- If the original window is being reused, remove all but a thin film of the existing urethane adhesive from the window surface by using a clean utility knife or razor blade scraper.
- Inspect the pinch-weld flange area for the cause of a broken window.
- Inspect for any of the following problems in order to help prevent future breakage of the window:
- After repairing the opening as indicated, perform the following steps:
- Verify all primers and urethane adhesive are within expiration dates.
- Shake the pinch-weld black #3 primer for at least 1 minute.
- Use a new dauber in order to apply the primer to the surface of the pinch-weld flange.
- Allow the pinch-weld primer to dry for approximately 10 minutes.
- Use a new dauber in order to apply clear #1 glass prep to the area approximately 18 mm (0.71 in) around the entire perimeter of the window inner surface.
- Shake the black #2 glass primer for at least 1 minute.
- Use a new dauber in order to apply the black #2 glass primer to the same areas (2) that the clear #1 glass prep was applied.
- Allow the glass primer to dry for approximately 10 minutes.
- When applying around the radius edges of the window, measure a distance of 17-22 mm (0.669-0.866 in) inward, for the radius edges only.
- Cut the applicator nozzle in order to provide a minimum bead of 8 mm (0.32 in) wide (a) and 14 mm (0.55 in) high (b).
- Use a cartridge-type caulking gun in order to apply a smooth, continuous bead of urethane adhesive.
- Use the specifications as listed above to guide for the nozzle in order to apply the urethane adhesive to the inner surface of the window.
- Position the window into the opening using the alignment pins.
- Press around the entire perimeter of the glass edge in order to wet-out the urethane adhesive bead.
- Tape the window to the body side in order to minimize movement until the urethane adhesive cures.
- Clean any excess urethane adhesive from the body by using VMP Naptha.
- Clean any excess urethane adhesive from the interior trim by using Acrysol.
- Use a soft spray of warm water in order to immediately water test the window.
- Inspect the window for leaks.
- If any leaks are found, use a plastic paddle in order to apply extra urethane adhesive at the leak point.
- Retest the window for leaks.
- Maintain the following conditions in order to properly cure the urethane adhesive:
Caution: Refer to Glass and Sheet Metal Handling Caution in the Preface section.
Important: Remove all but approximately 2 mm (0.078 in) of the existing bead of urethane adhesive from the pinch-weld flange.
| • | High weld |
| • | Solder spots |
| • | Hardened sealer |
| • | Any other obstruction or irregularity in the pinch-weld flange |
Important: 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 DE17®, 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.
| 5.1. | Remove all traces of broken glass from the seats, floor and/or defroster ducts, if applicable. |
| 5.2. | Clean around the edge of the inside surface of the window with a 50/50 mixture of isopropyl alcohol and water by volume on a dampened lint free cloth. |
| 5.3. | Allow the isopropyl alcohol to dry completely before applying the primers. |
Caution: When replacing stationary windows, use Urethane Adhesive Kit GM P/N 12346392 (Canadian P/N 10952983), or a urethane adhesive system meeting GM Specification GM3651G, to maintain original installation integrity. Failure to use the urethane adhesive kit will result in poor retention of the window which may allow unrestrained occupants to be ejected from the vehicle resulting in personal injury.
Caution: Failure to prep the area prior to the application of primer may cause insufficient bonding of urethane adhesive. Insufficient bonding of urethane adhesive may allow unrestrained occupants to be ejected from the vehicle resulting in personal injury.
Important: Do not apply the black #3 primer to the existing bead of the urethane adhesive on the pinch-weld flange. Apply the primer only to nicks, scratches or the primed surfaces.
Important: Use care when applying clear #1 glass prep on the window. This primer dries almost instantly, and may stain the viewing area of the window if not applied evenly.
Immediately wipe the glass primed area using a clean, lint-free cloth.
Important: The black #2 glass primer is effective up to 8 hours after applying it to the glass. The primed surface of the glass must be kept clean.
Important: Measure a distance of 14-17 mm (0.551-0.669 in) inward, from the top, bottom and side edges of the window in order to apply the urethane bead onto the window.
Use the measurements as a guide in order to apply the urethane adhesive bead to the blackout area of the window.
Important: The urethane adhesive bead must maintain a consistent height and width uniformity.
Important: Install the glass to the opening within 5 minutes after the urethane adhesive is applied.
Important: Do not direct a hard stream of high pressure water to the freshly applied urethane adhesive.
Caution: Insufficient curing of urethane adhesive may allow unrestrained occupants
to be ejected from the vehicle resulting in personal injury.
• For the moisture-curing type of urethane adhesive, allow a minimum
of 6 hours at 21°C (70°F) or greater and with at least 30 percent
relative humidity. Allow at least 24 hours for the complete curing
of the urethane adhesive. • For the chemical-curing type of urethane adhesive, allow a minimum
of 1 hour .
| • | Partially lower a door window in order to prevent pressure buildups when closing doors before the urethane adhesive cures. |
| • | Do not drive the vehicle until the urethane adhesive is cured. Refer to the above curing times. |
| • | Do not use compressed air in order to dry the urethane adhesive. |
