Jim, I have coated the insides of body panels of two cars before with NAPA rubberized undercoat and it made a big improvement in the amount of road noise. I haven't done it with the Delorean because I'm affraid of 'messing it up'. If you ever have to heat the metal to take a dent out, then it would make a big smokey mess. It was interesting parking my Chevy convertible next to one just like it and knocking my knuckles on my fender and then doing the same thing to the other guy's fender. The sound deadening effect was very noticeable. Walt Tampa, FL