I repaired bad rust damage in the rear windows of my wagon. If you have a welder, grinder, and some patience, it's not too bad. Getting the windows out is a little tricky. Use dadette123's method to remove the bottom railing trim. I broke a couple of the clips that held mine in - they were old an rusty. Then just carefully work the window seal starting at the top and back off of the frame on the inside while pushing out and the thing should pop right out.

I had to fabricate and weld in new metal seam pieces along the bottom window seam where the window seal mounts. I painted everything with POR-15 and then covered everything with a body seam sealer. I reused the original window seals as I couldn't find new ones and after a thick application of Dow Corning 111 they were nice and pliable again. I sealed the seals to the windows with a non hardening 3M sealer (which makes an awful sticky mess) and then reinstalled using nylon tools and the string method.

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'84 Euro 300TD Turbo, 192K