This is what I did on the '54. This generic dynamat is not all that heavy. I'd say that piece on the door is less than 2 lbs.
I just painted the inside side of the door with epoxy primer, over the top of whatever what left of the original deadening material, which looked like undercoating.
Then I used the "dynamat" as a vapor shield. It really may the door "thunk" when closed. And protects the door panels from moisture.
Now the 115-C, it may be a different matter. The top is always going to be the biggest source of sound and heat/cold intrusion. So not sure how much difference the "dynamat" will make.
Attach file:
dynamat.jpg (32.81 KB)
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