you could use 3M 77 Spray Adhesive or Super Spray Adhesive. wal-mart, k-mart probably target and most auto body stores/shops.
it will hold, you need to put it on w/ a heavy coat or better yet spray the insulation a coat, let it dry and then spray another coat. if you spray surfaces it will act a lot like contact cement. then make sure you get it in the right way/place. you may have some open time but not too much.
best of luck!:yes: