I've heard the roofing stuff smells really strongly, so it should be used in interiors. If it doesn't though, I'd throw a few layers under the carpet, I don't care if it's really sticky there.
So which Edead product is the best to use for the different parts: Trunk, Floor, Door, Roof, Firewall. Does anyone know where to get insulation for the firewall in the engine compartment. I need to replace mine and don't want the factory stuff.