I am planning ahead on my build a little to determine what the best route to go is for sound deadening products. I am curious what most are using, foil backed self adhesive squares? Or rolls? Or the thin cheap tar rolls ??
Right now looking at trunk area and remembering the broken mess I pulled out of my original unmolested 68.
Also want to do inside some the doors and other places while I can with everything stripped down to the bones.
Much thanks,
I used rolls of foil backed self adhesive Fatmat. It took the better part of 2 rolls to do the interior.
I used Self Adhesive Heater duct insulation. Picked up the tip from “Garage Squad” on Motortrend TV. Way cheaper than Dynamat, pretty much the same stuff. Available at Lowes/Home Depot. Yep, about 2 rolls, used the leftover for the top of the Fuel Tank in the trunk.
The Dyna Mat is a thinner, cheaper copy of aircraft sound damping foam EAR3201 or Y370. I have used all three and also used the factory style tar style. I think the EAR3201 is most effective and lightest. Not cheap! Y370 is cheaper but comes in 7" X 48" strips so not as convenient.
The OEM tar style is equally effective but a lot heavier while being the cheapest. Dyna Mat falls somewhere in the middle, not the most effective and not the heaviest. If you do the inside of the doors and underside of the roof with any of them it helps.
I am going to try the same stuff, the garage squad special - frost king adhesive duct insulation. The YouTube channel “AutoRestoMod” did a comparison of different insulation products (the frost king didn’t do that well if I recall, but I’m on a budget).
Unfortunately, IMO, the “best stuff” is no longer available. It was made by a company called Insulshield Technology.
I used their firewall blanket from under the dash up to the front seats, then I used their closed cell foam carpet underlayment on top of that all the way to under the back seat. I also used their “panel dampener” up under the front fenders to keep the front tires from throwing up debris causing star cracks in the paint on the tops of the fenders.
The stuff wasn’t cheap, nor is it lightweight. But when I close the doors it sounds like a bank vault closing. This also allows the AC and heat to work very efficiently and I don’t get ANY KIND of droning from the old school Flowmasters that have been on the car since 1994.
I might suggest you take a look at a spray on material. A painter friend of mine recommend UPOL Raptor coating. It’s worked great at sound reduction and weighs almost nothing compared to mat sheets. It doesn’t block heat so I used some foil up front. It’s a bigger undertaking with all the preparation work etc…
Thought I’d give a different perspective.
Is that like bed liner material?
Yes but much much more. 
