I think sedgewick is refering to "seel & peel". Never used it, but have read great things about it. goes in just like dynamat and is a fraction of the price.
http://www.lowes.com/pd_154017-81326-PS625_0__?ipTrail=67.96.104.4&zipCode=30114&address2=&state=GA&address1=2044+Cumming+Highway&catalogId=10051&productId=1018733&city=Canton&selectedLocalStoreBeanArray=%5Bcom.lowes.commerce.storelocator.beans.LocatorStoreBean%40cc90cc9%5D&storeNumber=2838&langId=-1&storeId=10151
