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Often overlooked in restorations, the seam sealer around the roof braces in a Camaro are usually long gone, making the braces ineffective. Duramix 4274 NVH Dampening Material by 3M is a two-part urethane product for replacing factory NVH (Noise, Vibration & Harshness) sealants and foams. Kevin Rock pulls the braces down while Jason applies the Duramix 4274. Clamps are applied where necessary, and allowed to dry.