These seals are extremely important. About 50 percent of the Bugeyes we see have some form of blistering at the union of the A pillar and rocker panel. If the windhshield doesn’t seal properly, water runs into the little cavity shown, which funnels water right into the front windshield post hole. You can see how the captive threads are wet, so it’s easy to imagine water dripping down into the flat A pillar floor and ruining your car.
The seals that keep out the water have to be done right. I’ve written before about rolling the cowl gasket under so that it forms a tight seal. When it’s unfurled flat, that cowl seal will wick water underneath the windshield, which will run down to the mounting holes and into the car. This car had cracks in the seal, which made water entry easy.
The pad gaskets also have to be sound. We routinely enlarge the holes on these to get them to fit, so that has to be done carefully or there will be more opportunities for water to find its way into the A pillar. Lastly, make sure to tightly butt the new windshield to body gasket right up against the pad gaskets. If they overlap, water will get in, and if there’s a gap, water will get in there too.
We sell new gaskets and you should check to make sure yours are sound. If yours are cracked, you’re due. Voids in the gasket under your windscreen will let water in even when you are washing the car. Good rubber will help you keep the water out.