I appreciate that. I have new (to me) glass which is perfect. The rear windshield I'm replacing is frosted and so is the one on my parts car. The newer glass is off an 89 420SEL and has a layer of the MB glazing compound. Though it sat in the sun for over a decade the glass isn't frosted. I suspect the MB compound is the difference between those.

I feel much more confident now that you've shared the instructions and advise. Thank you.

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84 300SD
85 380SE
83 528e
95 318ic