I just saw this being done at a local dealership. The idea is to keep water from trickling behind the door frame seal and down into the door including the door locks/alarm switches.

It seems the problem occurs especially when blasting the door/window areas with high pressure washers. Also in extemely wet environments over a long period of time.

Yes, the tech simply pulls back the upper door seals and applies a specific sealant, then is supposed to wipe away the excess. If done well, you shouldn't be able to see it easily.

Haasman

__________________
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)