Vapor barrier for doors

Looking for recommendations to make and apply new vapor barrier sheets for my '72 Dart Swinger's doors (and quarter windows too).

Plastic sheeting is available in various mil thicknesses. How heavy should it be? And what do I stick it to the door/quarter frame with? 3M spray adhesive? Butyl tape? something else?

thanks for any tips & tricks.
3M spray adhesive is good. 6 mil is plenty thick. Its not exposed to UV light so just about anything will work. Some manufactures use wax paper like vapor barrier.