My rear window grid can't be repaired, since it has all been scraped off.

The problem with a window with defogger grid of unknown condition is that the only real way to test it is to install it and wait for a day where condensation and/or frost exist.

The Permatex repair kit barely works as well. I repaired my grid in my '78 300D and only gained function in two more of the elements out of the dozen or so that are in the window.
Yes, I did it according to the instructions.

My only sure-fire option may be to get the window from Mercedes Benz, in which case, I'll live without the defogger grid. Either that or find a car that has a known working grid and take that window (if it's available.)

After my two-day ordeal with that rear window seal, the next time I install a seal, I'm going to have a guaranteed working window defogger because I don't want to do that again in the next decade.

Phil Forrest

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1972 220D "Trudy," named by a friend.

"The 220D sounds good... I suspect it is the only car that you need a calendar for, rather than a stopwatch, when doing acceleration tests."
Tom Abrahamsson