Not great for use as a gasket
Crutchfield Customer Review (What's this?)
I've always used Dynamat "Original" when installing front door and/or rear deck speakers. I like to use it as a gasket and have always been very happy with the outcome. I had an old roll from many years ago that I have been using on multiple cars. It finally ran out and I could not find "Original" for sale. Discontinued? Anyways, bought this and it is alright. It's more like thick foil with gum stuck to it. Works as intended but not as good as the "Original" for making gaskets.
Pros: Stops rattles
Cons: Like thick foil with gum stuck to it. Lots of creases and hard to get a good smooth look.