I am looking to see what everyone is using for door vapor barriers and how you are affixing it to the door.

I have not seen any kits available, and I assume most attach it with butyl of some sort.

Also, has anyone used an upgraded material? Modern cars use a foam sheet that offers an additional layer of sound deadening at the same time, I'd love to find something that worked in that manner as well.

'72 'Cuda