I put the Thinsulate on the inside of the door card / panel. I used a 3M adhesive spray, though very little because the Thinsulate will stay in place once the card is reattached.I saw your previous post about using Thinsulate foam. Did you just use it on the door panel? Does it have self adhesive? The foam i was referring took is medium density foam. I had some laying around. It was in an attempt to test the wind whistling noise.