I used the stuff that looks like paper backed insulation. It was a joke in my experience. I cleaned my door with w&g remover, used the adhesive tabs that comes with the kit, and after a few months the insulation still pulled off. If I were to do it again, I think I'd hire a spray foam guy to come and just fill them. Cheaper than a door, light weight, etc. If you wanted to pretty it up you could get some thin plastic and screw or rivet that onto the edge of the door panels, but it'd probably be slightly wavy. If it's a long term deal, spend the money and get a quality door.
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