[kathyricks]

FatMat is claimed to be nothing more than Peel & Seal rubberized asphalt roof membrane and smells like it too for a few weeks. So you might as well buy Peel & Seal from a roofing supply company for an even lower price than you could buy FatMat. The moderate asphalt odor does go away in a few weeks. But if you don't want the odor at all you should buy a butyl based product like Rammat.

I took a different approach to sound deadening than anyone else here. At the local self service auto wrecking yard I used a chisel to loosen several large and thick asphalt sheets from the trunks of several 1987 Toyota Cressidas. I then heated them up on a teflon pancake platter placed on a barbacue grille and then, wearing cotton gloves, I applied the hot and almost liquified Cressida asphalt sheets to the floor and cab back panel of my Toyota pickup. For sound absorption, I glued a layer of cotton shoddy padding on top of the asphalt sheets. I acquired the shoddy padding from the trunks of 1990's Cadillacs in the same wrecking yard. I also glued this cotton shoddy padding to the insides of the door panels. However, since the insides of the door panels can get wet, I waterproofed the cotton shoddy padding with a coat of Kool Seal UV Resistant Patch & Coat - a water based, odorless (when dry) asphalt roof coating product available in Ace Hardware Stores. In sum, I soundproofed my trunk cab for about $25 worth of junkyard asphalt sheets and cotton shoddy padding and $20 worth of Kool Seal.