I used Fatmat on my latest project. Sound proofing of the car doors.I have to say it's nice stuff and I would recommend it to anyone. The stuff is very similar to Dynamat, with a few exceptions.
Here's what I noticed...
Fatmat is similar to Dymamat extreme in the fact both have the aluminum backing. This was one reason I chose the Fatmat.
The application side of Fatmat is very very sticky. I would say even sticker than Dynamat. Sticky is good because it made for less time using the heat gun and that sped up the installation time by quit a bit.
Fatmat is lighter weight than Dynamat. This could be viewed as good or bad.
I feel it’s good because the cheaper cost per square foot allows for more layers to be applied. More layers equal better deadening with half the added weight at half the price.
These are all good things!
Plus I got a ton left over.
This is just my experience with the product. I’ve used dynamat in the past and found the price is just not worth it’s performance.
I also used Cascade Audio VB-1 deadening spray in combination with the Fatmat. I sprayed the inside hard to reach areas of the door then covered the outer skin with 2 layers of mat. Worked like a charm!
I love the way my car sounds.

Seth