Originally Posted by
ALBUQ F-1
This is a big topic on another car forum I'm on, where a huge glass rear hatch has to be bonded to a flimsy aluminum frame. The "fast" urethane apparently sets pretty quickly, which can be a problem on a big piece of glass, but probably not on a vent window.
On newer cars, the glass is actually part of the strength and structure of the car, and has to be glued in with urethane to achieve that strength. Some GM mini vans actually have to be blocked under the rocker panel at the front door when replacing the windshield, to keep them from having body damage when replacing the windshield. They have been known to collapse at the cowl if not done properly. That type of adheision is not necessary on a vent window. ;-)