[Christ]

The only uncool thing about Peel & Seal is that it's made of butyl rubber with asphalt for filler... that means that on hot days, the stuff can/will leave an asphalt smell in your car.

I've never gotten a strong enough smell that it couldn't be covered up by a simple air freshener, and obviously, this only applies if you use it for sound/heat barrier inside the car.

EDIT:

That kinda makes it sound like I'm picking on Peel & Seal specifically, but I'm not... ANY product with asphalt filler in it will do the same exact thing.