Extended Method Description
Use the extended method when the original urethane adhesive bead left on the window opening pinchweld flange (after window removal) cannot serve as a base for the new window, or in any case where the use of the short method is in doubt.
This method includes the following cases:
- The replacement of a majority of the urethane adhesive bead, where a thin film of the original bead remains
- Applying pinchweld primer to any exposed painted areas on the pinchweld flange
No mounds or loose pieces of urethane adhesive should remain on the pinchweld flange. Do not remove all traces of urethane adhesive.
IMPORTANT:
- If corrosion of the pinchweld flange is present, or if sheet metal repairs or replacements are required, refinish the pinchweld flange in order to present a clean, primer-only surface.
- 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.
- Appropriate materials for these primer applications are typically 2 component catalyzed products. Use materials such as BASF DE17®, DuPont 2610®, Sherwin-Williams PSE 4600 and NP70® and Martin-Semour 5120 and 5130®. Follow the manufacturer's directions for the mix, the application, and the drying times.
- After repairing the opening as indicated, shake the pinchweld primer (black #3) well. Using a new dauber, apply the primer to the primed surface of the flange in the bonding area. Allow the primer to dry for 10 minutes.
- Use the extended method of replacement and the appropriate urethane bead size when installing the window.