I understand that the acetic acid in many silicon compounds can be real hard on cars sheet metal. There is a substance that yacht owners use called "Capt. Tooley's Creeping Crack Cure". It is a thinner-than-water liquid polymer that flows into cracks and sets up as a waterproof plastic seal, and is used for a variety of applications besides boats - I have taken care of major leaks in a fountain and in a window sill with this stuff. If you don't have a marine supply location nearby, it is available through
http://www.improvementscatalog.com .
Other ideas on leaking windows were discussed at this thread as well:
http://www.peachparts.com/shopforum/showthread.php?threadid=12875
__________________
John
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E