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Where will you find not made in Chinesium windscreen glass for 240?
Will the windshield repair guy treat the rust underneath? They typically won't do it. You would have them remove the windshield and maybe remove some or all of the urethane / butyl tape that remains. And then treat it.
Like Art writes, I also had to treat a windshield replace with rust underneath. Some room temperature IQ dolt used a razor or something to to cut through the gasket, breaking the painted finish through the galvanization. All wholy through out the pinch weld pan from the corner and up both A-pillars. So I used the PRO-15, an imperfect process. I expect the POR-15 to lose seal and the rust returns. So bad was the rust there were holes in the pinch weld into the vent intake chamber. You could see the inner bulkhead / firewall through the small holes.
I could not find a Trempex, Sunex, Scanex for sale. Maybe in a salvage yard. Pilkington used to be made in Europa and USA. No more. Now you have the Autolite / Safelight and indie auto glass shops dealing in chinesium auto glass.
SEKURIT Saint-Gobain, I believe, still makes windscreen for Volvo 240, yet these are in Europa. A hefty price to import.
The made in chinesium pilkington glass now in my 1992 240 is light and thin and include a plastic border you press in the trim / reveal to barely cover the pinch weld. It's awful and the glass is not optically very good.
Also, using urethane on a rust repair may be fool hardy and the urethane carrier out gassing may act a solvent on whatever you used to seal the paint.
The stupid auto glass store jockey will tell you to use urethane as it strengthens the passenger cabin in the event of accident and roll over, I was told. They won't use butyl rubber tape. Volvo still sells, so far as I know, two sizes of butyl tape. Get new spacers that set at the bottom of the windshield. Also, ensure the drain hole at each pinch weld lower corner are clean and the finish sealed.
After replacing a few of my own and other fowlks' windscreen, I botched the alignment on the 1992 240. Oh well.
What I went through starting November 2008. And then too cold for the POR-15 process:

Hope that halps.
St Patrick's a prior, happier year.

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