Siless Black 80 mil (2mm) 36 sqft Car Sound Deadening mat - Butyl Automotive Sound Deadener - Noise Insulation and Vibration Dampening Material (36 sqft)

Used a few boxes of this stuff plus the foam sound deadener on top of this stuff and it’s insane the difference it makes. Did the roof, pillars, doors, floor and back cab panel on an 09 Ram diesel and you can hear your breath inside the cab after all the sound deadening. Sticks very well once you apply it and use a roller, very sticky on warmer days so I applied in the am when it was cooler out. Highly recommended

I've installed this in several cars and trucks over the past 5 years and have had 0 issues with it. easy to install, peels off easy, easy to cut with a razor blade\ box cutter. in my personal 51 ford, i installed in on the inside of the roof. it has held up for several years in the NC heat during the summer. no sag or releasing at all. it dampened the cabin noise greatly and is especially noticeable in the doors and truck lid. great price.

2017 Subaru WRX STI. This stuff is flat out amazing and hard to describe the difference it makes for not just music but also plain daily commute. I did about every inch inside door, sealed the door and used the trim to cover the panel-back. One box got me HEAVY coverage on 3 doors but NO QUESTION ordered another because this stuff is definitely going on rear dash, trunk, and may do whole floor pan. Tips: BUY A ROLLER SET. Also throw a clear sheet of (garbage bag) plastic on your door, sharpie around it then trace on cardboard and cut out. Do one front and one back and BOOM, you just made your pattern for the other side too and saved yourself hours. Don’t try and do a panel without a pattern, much easier to have it, and throw it on there and stick it down done. This stuff is not a quick project, but if you are considering, you know what you are getting into and WELL worth the effort. I did one side of the car and left the stereo stock and tested it against the other with none and will tell you it made the stereo(HK Premium) sound just about good enough to consider leaving. The side with the Siless was just crazy quiet and music was clean and tight like never before. It was louder than the other and you could “feel” the music coming from that side of the car. In all EXTREMELY impressed with the product. Very mild smell when working with it, but none in the car now that down and that is in CA heat.

I used this to line the trunk of my miata, it was super easy to work with and seems to have good adhesion (time will tell) so far. I love that it is black so it doesn't appear like you have lined your vehicle in tin foil. Will definitely use again.

Just as good as more expensive brands. I installed when weather was hot and used the roller to make sure it was good. I cleaned the surface with alcohol first. Went to install new speakers a year later and looks like i just did it. Perfect.