DYNAMAT 11103 Dynaliner 32" x 54" x 1/2" Thick Self-Adhesive Sound Deadener

I've got an old diesel truck and it's very loud. I thoroughly researched a number of products to line the hood and decided to stick with the big brand Dynamat. There are cheaper solutions from the hardware store if you just need a little foam padding, but if you want the best, buy this. Generally quality grades go (from best to worst): Aviation, marine, automotive, consumer/home. This stuff is made for cars and will outperform nearly any home-use product like foam for an attic etc. I contacted Dynamat and they officially do not sell on Amazon. They do officially sell with Summit Racing but the prices are much higher. I decided to order from Amazon directly and check the product. There's a lot of knock-off Dynamat online from less reputable vendors (Ebay etc). While the knock off stuff looks the same, it is not always closed-cell. You want closed cell foam for any exterior installation. Open cell foam will soak up water like a sponge and weigh a ton! Using the roll I got from Amazon and a 1ft by 1ft sample I got directly from Dynamat tech support, I confirmed the Amazon listed product I received was genuine. I even went so far as to weigh each square on a postage scale, soak them in water, and then weigh them again. Neither absorbed any water. The weight was the same after soaking. Installation was straight forward enough. Measure twice, or three times, cut once. I was able to cut the Dynaliner with a good pair of kitchen sheers and this seemed to work much better than box cutters. In order to ensure proper sizing, I cut out templates using construction paper, taped them in place on my hood using painters tape, and then traced them onto the Dynaliner. Be sure to get every nook and cranny filled. You want to ensure the liner is adhered to the entire surface with no air bubbles. To achieve this either start at one side and move to the other SLOWLY, or start in the middle and work out. I went side to side because I could trim off any excess when I hit the final edge. Peel the backing away as you go vs all at once (unless the size piece you are applying is small) because the adhesive is very sticky and it will be hard to keep it from sticking in the wrong places once you remove the backing. I did not use w DB meter to measure the sound drop in my interior but it is significant. I will report back in a year or 2 on durability but so far it looks great, and really cuts down the noise.

Worked well for headliner installation keeps a lot of heat and noise out sticks well too

Awesome product very easy to work with

A bit pricey, but does the job really well. I used the product with the Dynamat Xtreme and it had a huge impact on deadening sounds coming from the car itself. I drive a convertible MX5 NC. Very satisfied with the results.

I was refurbishing a removable hard top for a 1984 Mercedes SL and needed some foam for under the headliner. You can pickup cheap foam anywhere but it will absorb water, not as good as keeping heat/cold out and does not have the self adhesive. I had used Dynamat Extreme and Dynaliner on the floorboards and found a huge reduction in heat and noise reduction so I thought I would do the same on the roof. After stripping and repainting the hard top I cleaned the inside top cut and applied Dynamat Extreme with the Dynamat roller then cut and applied the Dynaliner. It really sticks! Then I put in a new headliner and installed all the trim. Now the car is so quiet with the hardtop, it is like a sedan. These older Mercedes are not as quiet as the post 1990 models and mine has an aftermarket Ansa exhaust system so it does have a bit of a purr when cruising. So I also added some of the remaining Dynaliner under the rear seat and over the wheel wells. Now the car sound like a.... Mercedes. Just after installing the new Dynaliner, I took a summer drive from SLC to LA - through the Mojave Desert. I kept putting my hand on the headliner and it was cool to the touch throughout a 110 degree day. WOW. Even if you don't think the foam you are planning to install will ever get wet, use this stuff. Condensation will find it's way into just about anything and normal porous foam hold that water and start to smell. This stuff is better at isolating sound, much better insulator and won't absorb water.