Is your 67-76 A-body windshield leaking ?

matthon said
This stuff is excellent for window openings with rails or walls or the pinch welds where panels come together, whatever you want to call it.

Gasket has a groove that slides on to the rail.

So, I went and opened my seal, WCR D690 for 68-72 A-body excluding Duster.

Exterior of gasket has a tongue and groove along the sides, and the top and bottom corners are completely open.

Any water that gets in will drain out the bottom corners.

The bottom of the gasket has a groove for the bottom rail between the cowl drain holes, separate from the rest of the gasket, last pic.

Problem is, there is no bottom raised rail on the car.

If water gets into the groove on the top/sides of the gasket, it appears the gasket directs that water to the cowl drain holes.

Why is there expectation that water will get into the groove on the top/sides of the seal, and therefore need to drain, but not into a useless bottom groove?

Why have a bottom groove that has no male counterpart?

Why design it so water can easily get under the bottom into that groove and have nowhere to drain?

With no sealant, it just looks like those drain holes could easily become overwhelmed.

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It sounds like your car and my '74 have the same body construction in the windshield area, but use a different gasket. My gasket has a round cord-like lock strip that gets pushed into the gasket, on the top and sides, after the glass is installed. Along the bottom is a flap that gets tucked into a groove in the gasket.

However, my thinking is like yours, in how does all the water get sent through those two relatively small holes? The pinch welded sides and top make sense. When the pinch welds come around from the side to the bottom, they transform to that flat area, and that is where the water can run up, over, and into the car. And I can see how water would easily come in without a pinch weld wall to climb over.

I would think that many cars are designed without drain holes, and the water sits in there until it dries. (Probably why cars rust there.) The gasket could be sealed to the body, then sealer is put in the gasket groove where the glass goes.

I must be missing something. I would think that anytime those 2 drain holes get overwhelmed (easily, I would think), water going to come in.