Extended Method Description

The extended method is to be used 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 replacement of a majority of the urethane adhesive bead, where a thin film of the original bead remains and applying pinchweld primer to any exposed painted areas on the pinchweld flange. There should not be any mounds or loose pieces of urethane adhesive remaining on the pinchweld flange. It is not necessary to remove all traces of urethane adhesive.

IMPORTANT:
^ If corrosion of the pinchweld flange is present, or if sheet metal repairs or replacements are required, the pinchweld flange must be reftnished to present a clean primer only surface.
^ If paint repairs are required, mask the flange bonding area (prior to applying the color coat) to provide a clean primer only surface.
^ Appropriate materials for these primer applications are typically two component catalyzed products such as BASF DE 17, DUPONT 2610, PPG DP90 (or equivalent) applied by following the manufacturers directions for mix, application and dry times.
^ After repairing the opening as indicated, shake pinchweld primer #3 (black) well, and using a new dauber, apply to the primed surface of the flange in the bonding area. Allow to dry for 10 minutes.
^ Use the extended method of replacement and appropriate bead size when installing the window.