if you want to just BUY some, go to lowes and go to the airconditioning area and look for peel and seal. its like dynomat fat mat and all that other crap but wayyyyyy cheaper. 12.5 sq ft. for 15 bucks.
no its made for ac vents in the attic. and it gets hot as hell in attics lol. thats what i have on my car and its worked great. most of our competitors use it around here