Say what you want about fatmat, but it never smelled up my interior, after the first day the smell was gone, and it made a very noticeable improvement in road noise. When you closed the doors it made the truck sound and feel solid, not like the empty tin can it sounded like before I installed it.Fatmat is garbage. It's roofing ice & water shield, not butyl based sound deadener.
It will get hot, smell like tar, and run.
If you don't want to use dynamat, use Raammat, or damplifier pro.