Used to be an excellent comparison on this site
http://www.sounddeadenershowdown.com/
Now he sells the stuff. Wish I could find the old article/test results, done very simply and easy for the average guy to understand, and easy to see why the real stuff is preferred even if it cost more.

Last time I read the comparison Second Skin was #1, for quality vs. price. But it's been several months now.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-