There is a spray in or roll on liner called cool car, but I believe they changed their name to Lizard skins, It looks like a bed liner when it is installed but it is a sound deadner and heat block so it keeps the inside of the cab cool too. I know a shop that uses this and it is good stuff. It comes in a 5 gal for about $150. I plan on using it because you dont have to cut and fit like brown bead. Just apply it with a brush or roller or if you have a undercoating spray gun and compressor its easy.
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