has anyone used this or heard anything from it........http://www.ebay.com/itm/interior-sou..........because the price is very cheap so im thinking of getting it for sound deadening my whole car.

 

It'll work. It's almost identical to what a friend of mine uses in his upholstery shop. If you're looking for something cheaper, check out Lowes/Home Depot,they carry something almost the same, and you may save a few bucks