Rockmat 50 SqFt Butyl Rubber Sound Deadener Material Bulk Car Kit (RM50RT-B)

Very Good. I have used fatmat, norcool or whatever and certain other products and have always preferred dynamat extreme. I have learned to always select sound deadener with butyl rubber compound versus asphalt. I was thinking about the NVX product but I choose Rockville as it had better reviews. This product was competitively priced, used butyl rubber compound, had good reviews.I have thus far only installed it in two places, this review is limited as I do not have any comments about it's long term use.1) Installed on the inside of speaker boxes. I recently upgraded some speakers that were sold out of a van. I put in all new drivers, a new port, and a 1st order crossover I built using calculators online, which was crossed over approximately one octave higher than the tweeter could go. Despite being my first speaker build I could tell there was some promise but it was held back by the box itself. There was loud slapping if you will as I changed out fairly poor drivers to pro audio style mid-woofer and JL subwoofer. I could have built a new box, and maybe one day I will, but I choose to instead coat the inside, especially the joints with this rockville butyl rubber deadener. The results were dramatic. The system played louder and there was no box slapping at moderate-high volumes. I have not pushed it yet to a very loud level but the output was both clearer and louder. It has changed the speakers dramatically.2) Applied to the inside of Avalon doors. In my toyota avalon I have mounted 6x9s infinity reference speakers. With the bass turned up just one notch, or any volume on the head unit over about 38-40 the doors would rattle. I applied some of this product to the inside of the door then sealed the openings as best as I could. I also applied this product between the woofer and the door and liberally to the door panel. The sound is much better and can produce good bass, there are less rattles, the car is noticeably quieter. I can now turn up the stereo to a point where it is quite loud without rattles. I will post this product review on my blog as well.

UPDATE 1/10/18I have installed about 150 sq ft now. I have seen and felt dynamat extreme in person and I couldn't tell a difference between it and this stuff other then the price! I have a couple more rolls to go but then I should have the coverage I want. I put some on the inside of the doghouse in my van and I can't even hear the 7.3l diesel engine running with my head up against it! Awesome!Original:I wanted dynamat extreme but it's just too expensive. This stuff feels quality, installs easy and so far as I can tell does a really good job. I'm doing the entire inside of my 03 diesel ford van. It is gutted obviously and it is very noisy driving it. I'm putting this down as a first layer since im doing a camper conversion. I currently have one wall 60% covered and the other side is just bare metal. Knocking on the outside of the van on the bare wall it's pretty noisy, hollow, metallic sound with a faint rattle around the outside edge of the body panel. On the dampened side it sounds like I'm knocking on a solid wood front door, or a thick fiberglass boat hull. I won't be driving it for a while still but I will update when I do, I expect it will be a fair bit quieter. If you don't want to pay the dynamat premium because of diminishing returns past this price point I think this is the stuff you want. I know I will be buying another roll or two to finish my project!

We used 1 roll to reduce the road noise on a 2009 Matrix with 2 layers per door on for doors, one on the inside of the exterior door sheet, one on the interior on the inner door structure (inside the plastic cosmetic door layer that everyone sees). We used about a quarter of the second roll to deaden the sound under the hatchback deck and rear wheel wells. We learned a lot about popping off door panels and everything covering the rear deck! We got about 4 db noise reduction at 60 mph according to a phone app, but to our ears the noise reduction is more dramatic. I think the reduction of the mid to high frequencies is even greater. Have you ever been in a forest when there is a breeze, and you can hear sound all around you from leaves rustling, but when you stand beside a particularly large tree the noise of the forest disappears from that direction? That's the sound from the back of the car now compared to the sound before we installed this material.Installation advice: On our first door we measured and cut carefully to make pieces that would fit between structural members in the door. But eventually we figured out that it didn't matter, and it went quicker to just cut rectangular pieces of a manageable size with a box cutter, then if needed trim an edge with scissors, but usually just plunk it down where we needed coverage, and later go back and fill in with smaller patches, overlapping a little. This stuff can go under the reinforcement beams if there is a gap, or run up and over the beams. Nobody will see this layer, it is all interior, just keep cutting and applying and overlapping and patching any remaining gaps.I used work gloves at the beginning, but eventually to get a better feel I went bare handed. I got no cuts. Just remember to pat the adhesive on, don't run your hand along the edges, or you could get cut. The roller included works very well, but be careful not to cut your knuckle in tight quarters. The metal coating is probably thinner than a soda can, but strong enough that the several times I caught an edge I was pleasantly surprised not to have been injured, so be careful!