I’ve got a ‘95 e350 girardin. I removed the screws to remove the windows to reseal as you are, but no matter how much I scraped, leveraged, or heat-gunned, I could only remove one window. I seriously couldn’t. It was so frustrating. So I resealed that one the best I could and put it back, using these jury rigged clamps to hold it in place.
For the rest of the windows, I applied generous amounts of dynatron 550 seam sealer at all exterior seams of the window. And I’m talking generous. I used a rag to sort of squeegee them into the cracks and crevices to seal it up as best I could. After letting it cure for 24 hours, I took a hose to the windows and inspected for any further leaks. There were one or two, so I reapplied the seam sealer in the same way. 24 hours later, another hose check, and now I have no more leaks!
If you go this route, make sure you don’t cover the seams so much that the window can’t travel all the way down. Just make sure it can move as much as you want it to.
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