Review on 🚗 Ninety-Mil Thick NVX SDBP40 Car Sound Damping Mat - 40 sqft. Butyl Automotive Sound Deadener for Audio Noise Vibration Insulation and Dampening (Ten 18” x 32” Sheets) by Tim Wheeler

Works as advertised. I installed it near the tailgate of my 84th Corvette. It used to sound like a drum with a soft, light tapping on the surface. Now, after installing the soundproofing, the sound is much quieter. This area took 5 1/2 sheets. I'll move on with the rest of what I have left. It may also be necessary to finish the bottoms of the doors and the transversal tunnel. I am attaching a photo of the finished piece. I hope this helps you decide which sound deadening materials to buy.