http://www.secondskinaudio.com/the only company I'll deal with great product at a good price. they have everything from butyl to different coatings. I did my entire car with their damplifier pro product and couldn't be happier with the results..
if you take a look at the comparison "quietcar" did they compare their product to asphalt mat which is going to be the least effective sound deadener product out there....high quality butyl is the way to go
