DBDRAGGUY
10+ year member
CarAudio.com Veteran
Peel and seal and other roof repair products are similiar to original dynamat. The same idea applies to both adding mass to the panel to reduce vibration. Peel and seal will work for adding layers to a panel (I have used it). Bed liner products work just as well. My personal best results came from a rubberized sand mixture that can be bought at any home supply store for about $15 for 5 gallons.