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. |