Thanks for the info everyone. I recently bought a blowgun, so I have picked up an extra of the cheap blue walmart pads to make target for it. I will be able to use some pieces from that one to experiment on the cozy with. However, I am also involved in a new house being built, and we're friends with the AC guy. I saw in his van, some stuff that looks alot like the stuff from the website Glenn mentioned. I may ask if I can have a piece or two of scrap of that to mess with too. We already have some of the metal foil tape, which I assume would be the best stuff to use with the metallic bubble wrap material.