I have used this stuff which is a late model OEM type of stuff. You don't need full coverage. For example, on a door panel, about 1/3 coverage, right in the middle of the door, makes a HUGE difference in the tinny sound!

3M Sound Deadener

With that type of coverage, the price works out really good compared to those hot rod shops "Dynamat" stuff!

Mark

1951 Chevy Suburban
In the Stovebolt Gallery
Lots and LOTS of pictures
Project Journal --- 10 pages worth!