I & mine family have been in the industrial foam insulation buss. for over 30 years, I would not use the foam in the can stuff you get a hardwares, 1. it is only .05 pound density(only like a r-1 insultation factor) 2. there is NO way to spray it out even 3. it WILL rust your vechicle out!!! 4. yes, they are putting it in some new cars, but they only got to last until the warranty goes out!!!! use something else