Got a cracked weather seal for the windshield or backlight?

Try plumbers putty. It's soft (when new), very cheap, and can be pressed into the cracks like tumbable plastisol that is used for body sealant.

I used it on the backlight rubber weather seal wedge shaped cracks of my 240D to stop the leaks into the trunk. Pull off a chunk and press it in the void. I also used it around the rear tail light where it was leaking as well. I removed the rear tail light and rolled it into a "snake" and pressed it in place. Next I installed the tail light assembly. I removed the excess with a plastic putty knife. Yes, it's not terribly attractive, but gosh... it does work!

If it seals water leaks around your home's sink for years, then it's got to be good. I'm not sure how long it will last on the exterior of the car... but for a quickie fix... it's great!

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Pete Williams, President emeritus - MBCA-International Stars (Eastern Mich.) Now Wi. & Az.
1985 300D Manual 4 speed Green Hen's tooth
1979 MGB triple black Az car nice
1969 back 1/2 of MGB (Az home built trailer)
1991 Volvo 245 Wagon Nice AZ Restored Gold Brick
1983 Jeep CJ7 37,600 Miles Summer use only