i just posted some notes and photos from my leaking rear door vapor barrier repair. enjoy.
vapor barrier repair
The 3M Windo-Weld Ribbon Sealer worked well for me. Here are the parts I used:
3M# 08612 - Windo-Weld Ribbon Sealer, 3/8" x 15' round bead
3M# 03618 - Adhesive...
I am in the process of narrowing down my damp carpets on the left side (drivers in North America) of my new to me M6. I have ruled out the under cowl drains - I pulled them all apart, cleaned and tested them and they drain like a champ.
My testing has narrowed down 2 possible sources...