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If sharing useful knowledge is too difficult for some, they should avoid the internet, IMO

Alum to plastic is a tough nut to crack, mainly because the expansion rates are so different, and a hot dash says it all. So look for an adhesive that remains slightly flexible, as I doubt there are any structural concerns here.

Based on what? His deep and long experience with acoustics and/or his college level thermodynamics training?

Explain first what purpose installing it would solve? Not to be ridiculous, but that mat's intended(?) purpose is to reduce transmission, so unless your very loud car stereo bothers your neighbors when you arrive home, because you have a wimpy mufflers, or you need to do in car remote live pod...

Since most sound proofing or thermal insulation has overlapping shared positive qualities, I've always been of the camp, you can never have too much since weight is seldom much ,and if one can afford the cost. The $200 does sound a bit high. Roof sound proofing is more about...