Be carefull with any of the foil backed "peel and stick" stuff that you can buy at Home Depo or any other hardware store. When I built the roadster pickup, I tried to save a few dollars, and used the home Depo stuff in the doors. I followed all the instructions, cleaned the inside of the doors carefully before the application, and used a roller to make sure that the "insulation" was carefully pressed into place. After a week of setting out in the sunlight, I had a great big ugly wad of this stuff in the bottom of the doors, and nowhere else. Then I had to dig it all out, and start over again with Dynamat---and have had no problems since.---Brian