That looks like some incredible stuff, indeed! A 23 db reduction with a 1/16" thick product. Have you tried it? Would love to get some comments on how well it actually performs.
I do appreciate the info; but that published literature really sounds too good to be true. It takes about 10db for a human to see a perceived doubling/halving of sound "volume". So this would cut sound by about a factor of 2.5. Sign me up!
But... I wish they would have included some data to support that. If this stuff was this good, we would be seeing it on everything. But all the motorhomes in dealers yards still have 1-2" of foam/something aluminized/or the old school perforated white ceiling tile looking product.
The car stereo guys are really big on noise reduction - Dynamat is a well known brand. And their best single application product (Hoodliner) has a 3 db reduction, from 100 to 10000 hz.
Click on the "Hoodliner Information" link at the bottom to download the pdf. They have 2 other products to add to the hoodliner to increase performance.
But they also have no data to support how those 3 items perform together. But they do make the finished product thicker: Dynamat Extreme applied 1st, with Dynaliner 2nd, with the Hoodliner on top.
Hopefully someone else can chime in with some other data? Jeeze, with all the motorhomes with engine hatches out there, I'm surprised there are not as many threads as the best oil to use...