Do these things actually work? Just spray away, and the sound dampens? Or this just some marketing BS?
http://cgi.ebay.com/Car-Audio-Sound-Dampening-Spray-Deaden-Your-Ride_W0QQitemZ9736486950QQcategoryZ67760QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
http://cgi.ebay.com/Car-Audio-Sound-Dampening-Spray-Deaden-Your-Ride_W0QQitemZ9736486950QQcategoryZ67760QQssPageNameZWDVWQQrdZ1QQcmdZViewItem