Yea I believe it says you have to spray the sound on first then the heat. I only ordered one pail of each so I'll do the firewall and tunnel with the heat and if I have enough I was thinking around the inside of the cowl. The doors and floor and maybe the roof will get the rest, I'm not sure how far it will go so that may change. It says about 100 sq. feet on their site but Summit says more like 50.

It's probably the same thing already .

Sean