1 Quart GT Liqui-Damp Automotive Car Liquid Sound Deadening Kit - Includes: Application Brush, Degreaser and Disposable Gloves

Pretty cool product, I applied this to my trunk lid and seems to be doing it's job well. While I have no basis to judge the quality of this product compared to other products, it definitely helped beef up the rear of my car. The trunk is more quiet and the rear doesnt vibrate as much but I dont even have a sound system yet. Nor have I had a chance to do the actual cabin to really see how well it performs. Hasn't cracked either, I was initially worried about cracks forming from the shock of closing the trunk but it hasn't seemed to budge.

Intentional typo to make these tards feels smart. Speaker boxes are typically made of MDF, which literally means medium density fiberboard, meaning ITS NOT DENSE, therefore sound can escape or get absorbed by the board (more the latter). This product dries at a higher density. think of it like shutting your screen door in your home (MDF), then closing the door to that same door (Sound Dampener)

Very happy with how this product is working out. I used it to coat the spare tire recess well on a Subaru outback. One container was enough to do two coats on the well it self. The finished product looks professional and the noise difference was noticeable. After trying the product I bought more to do another car.

I used this paint on top of their matting inside my cheap subwoofer box and the sound was a lot better.

A bit messy but seems to work great