Fire blanks work very well actually. I have used them.
It's basically a fiberglass blanket with some type of fire retardation crap one them. They just cut off the air supply and insulate the heat so you can hold them on something long enough to get it in place.
I remember seeing a video once about firet companies experimenting with them for car fires and suck.

But you are correct the hood liner is for noise and insulation from heat to protect the paints life span.