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 such as BASF DE17, DUPONT 2610,
PPG DP90, or equivalent. Follow the manufacturer's directions
for the mix, the application, and the drying times. • After repairing the opening as indicated, shake pinchweld primer #3
(black) 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 appropriate bead size
when installing the window.
