like what kind of work? I am very curious about this b/c all these sound deadener companies claim there product is the best but there is no actual test format to prove one is any better than another or how one is different from another. I'm just tired of hearing that "company A is junk b/c I don't have the tools to apply it correctly" when the truth may be that it may actually be a superior product. the only test I've ever seen is the oven test at 400˚F for whatever amount of hours, this test I find is useless b/c I've never seen any part of a car reach 400˚ except for the exhaust. I've also see the bell test, when you put a piece on a bell to show how it doesn't resonate, again another useless test b/c you can put duct tape on the bell and it'll do the same thing.