Chip Foose works with OLD RATTLERS and HOT RODS ... I am sure he has to cover all surfaces 3~4 times with Dynamat layers ... for new cars sound deadening is piece of cake, but for old cars ... very difficult
One of our Islamabad friends has a german car .. probably 1982 model ... he has been working frantically to stop the rattling ... and as of now, he is going to use Dynamat because his rattling wont stop with other conventional sound deadening materials