Hello Jerry,
Dynamat on the inside of the footwells and sandwiched between the Stainless steel and fiberglass on the outside, water proof, heat proof and sound deadening.
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I also did the same thing on the footwells of the Unique Cobra Roadster I built a number of years ago, there are additional pictures in my gallery.
Website for Dynamat.....
http://www.dynamat.com/
Tony R.