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Originally Posted by H2O_Doc
You might well be right, but my point is more about whether or not you need edge to edge coverage versus strategically placed material. If you are trying to keep a sheet of metal from flexing or vibrating (and thereby transmitting sound) then you might not need material near the edges (think about striking a drum in the middle versus the edge). Greater thickness will certainly increase the dampening, but I'm not sure you need material where the sheet metal is already pretty stiff.
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I've done entire vehicle's and only certain panels. You may get slightly less noise doing an entire car with a rubber backing sound mat. There are other salutions such as foam which absorb sound much better than sound mat. What I am saying is the mat does give you a layer of quieting your cabin down but mostly it's used for vibration control for panels as you said, that flex and rattle. Given that I would only do door panels , wheel wells in trunk and possibly the trunk as well.