The only things not addressed were ease of application and performance (but that would be either subjective or ASTM 756 ($1500 per test at many facilities)). I was skeptical but that was a faily well done test regimin. Without actual ASTM testing I figure a sum of adhesion testing, thickness (density), and weight (more mass is good mass for damping)

 

Resurrecting.
Any new ideas or places for sound deadening....I'm in Grimsby...thx