Anyone know anything about the sound dampening stuff that comes in a can? i saw it on sounddomain.com and a couple other sites and am wondering how it compares to dynomat? also, is it easy to put on and how much does it expand (assuming it does, I don't know), will i have trouble putting my doors panels/ carpet back on? will it save weight over dynomat?

Anyone with experience with this stuff, let me know about it if you would. also, any specific brands would help too.

Thanks,
meyers