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I took my windshield out to replace the gasket and I found a dissapointing amount of rust along the top of the cab right above the pinch weld on the outside of the cab. The rusty spots are on the part that runs parallel to the ground. A quick pass with a wire wheel revealed a few pin holes and two holes about the length of a quarter and about 1/4" wide. I can see right through them into the mouse nest in the cab where the visors mount. I cleaned the mouse nest out and POR-15'd the whole mess, but I'm worried about leaks and further rust. Is there a very good way to repair this? Welding it would be difficult because I can't get behind it, and it is crusty rust. Should I fill it with JB weld and goop it up good with windshield sealer? It is cosmetically behind the window gasket but it was obviously exposed to water. The rest of the pinch weld is nice and strong so I don't need a structural repair but I want to prevent further rust.

It's a '50 three-window cab.

I would use the POR-15 epoxy putty or the fabric mesh from their floor pan/truck repair kit.

You can have the windshield gasket "wet sealed" after it is installed. I have had this done to my truck and suggested it to another friend who had leak problems. Makes a big difference.

New rubber will not stop leaks necessarily so be prepared for this.

Wet sealing basically is burying the gasket/body/glass in a sealant very cleanly so that it is not noticeable looking at it. It solved my problems.

I was planning to do that anyway, it's what the manual recommends. I am doing this job myself. I think it rotted from the inside- out.