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Oz of prevention equals a pound of cure still holds true IMO.

The purpose of the material sticking to the metal makes the metal think/act like its thicker/heavier which is the process by which it lowers/dampens the resonance that is excited in your "drumhead" trunk floor. You could also use a pick up bed like heavy coating that would not allow moisture...

No need to be sorry, unless you are breaking B Body unwritten rules about "arguing" in someone else's thread, which will apparently will get you deleted. So, a claim based on "common sense", and no more, correct? BTW, we weren't discussing "useful", we were discussing the "why" part, to be clear.

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...