394mil 24sqft Pack Thickened Sound Deadener for Cars - Auto Sound Deadening - Closed Cell Foam Noise Deadening Material - Heat Hood Shield Insulation Dampening Mat

This particular foam insulation was more stretchy compared to other brands which made it easier to wrap around the bumps on the car door. The texture and feel of this foam is more neoprene and less like a camping/yoga mat. The backing is sticky enough to adhere to the door's surface but you cant heat it up a little bit to get the glue to be more sticky if you need.For this to work as a "sound deadener", make sure to also use some sort of butyl rubber as the first layer. This foam alone won't help with the vibrations caused by the wind on the door panels, it just absorbs some of the sound waves.

Great soundproofing material for keyboard customization. Cheap and the adhesive seems pretty good. Did a great job of making my keyboard more "thocky", if that is the sound you are looking for.

This sound foam made a significant difference in the noise from upstairs plumbing pipes. It was easy to install and with a couple of layers, it's really reduced the sound of water. I'm happy with it.

Very easy to work with. Very sticky and has some stretch.

Great product and adheres nicely.

It worked for what I needed, but seriously why does everybody need to charge so much for something so minor?

Material was really easy to work with. Used it to apply sound insulation under the cowling of my outboard engine. Definitely quieted it down to a more tolerable level. Would used this stuff on everything.

It'll work for keeping the noise floor in a car lower but won't be as effective as actual sound deadening material. Very soft and can be used for vibrations or in-between speakers. Doing the knock on the car door test, it definitely doesn't make the door sound solid. Still sounds hollow unlike my front doors. Probably wouldn't buy again but still useful and sticks very well.