Anyone know anything about the sound dampening stuff that comes in a can? i saw it on 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.