deadning-auto barrier vs studio barrier

[fair warning]

Has anyone looked into or used studio or building soundbarrier such as inhttp://www.soundprooffoam.com/econo-barrier.html in an auto application. How would it compare with auto deadning. I see know reason why it would not hold up in a car. This stuff is 1lb per sq. ft. There is a lot more tech info on it then stuff for cars, such as stc ratings. What are the stc ratings for the auto deadning.

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