MB originally used glue to stick the VB to the door, I use that too along with 3.5 mil plastic sheeting from Home Depot. Its a good technique for cars with straight door cards like the W123 and W124, If you have a car that has sunk door cards you need a fully water tight seal on the VB.

I helped a friend on his BMW 530i 2002 to fix water leaks - used 3M window weld ribbon and a heat gun to stick the foam VB in place. We also fixed a Honda accord with a HD contractor trash bag as vapor barrier and the same ribbon sealer then cut with an exacto knife along the periphery of the new VB. Looked nice - and that trash bag is THICK

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)