I've always used Butyl mat to dampen my vehicles, and only used the spray stuff in hard to reach places. But I was wondering what the damping factor of a spray on liquid would be compared to a good mat product? I like the Liquid because it's easy to apply, but was always curious of how well it actually dampened. Like, would $100 worth of liquid work as well as $100 worth of mat? Anybody got any comparison info?