Blaze im gonna steal your pic if you dont mind, I always need one when im trying to explain this to peeps but ive not found one till now

In addition to what everyone has said, look closely along the bottom of the door in blaze's pic. See the 2 small holes? (not the lower ones for the door card clips) Make sure you DONT block those when you fit your membrain, if you doo, water cant drain and sits at the bottom, no matter how well you seal it if that happens it will seep through eventually!
The 2nd sheet stuck to the bottom of the door trick works well to prevent this from even happening though, as any water that gets in is deflected off that sheet and never ends up in the bottom of the outer sheet.
Edit: I've always used
waterproof duck tape, never had any leaks. Done it on 4 cars so far
