This weekend while washing and waxing my 99 ML320, I noticed that the trim around the windshield is beginning to show signs of drying and cracking along the roof. I checked a buddies 98 ML320 and noticed the same thing. Does anyone else have this same problem?

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1990 300CE-24
2003 SLK230 (Sport - 6spd)
1995 Ford Thunderbird