As for the feel under the carpet... if you've ever removed your carpet, there's a thick layer of rubber backing already under the carpet. Any uneveness that you're going to get from the spray-on is going to be a LOT less than the lip of a dynamat style sheeting.

And when it comes to weight... that's the name of the game with deadening... adding Mass to the sheetmetal panels... thus adding weight to the panels to change how they vibrate.

 

Does that stuff leave a smell in the car?

 

i installed it over the winter months, so i cant answer that as of now, when it gets warm out ill be curious. Even if i have a little smell which i doubt i will, its worth it in how quite the car is now, and dont forget carpet or panels cover everything so its not exposed

 

Bringing this thread back to life. Has anyone used a spray on like 3M and then used peel and seal or edead? Seems like that would be a good combo unless the adhesive mat wouldn't stick to the 3m. Just a thought. I am currently ripping out my interior and only want to mess with this once.

 

I don't think the adhesive will stick to the 3M. I did alot of research on temperature range and sound deadening quality and decided on "second skin". It came in 2'x3' sheets and was cheaper in bulk. You put it on with a roller. You have to wipe down the area with alcohol to make it stick. I used it on the floor pans, door, and hatch. Very pleased with the results. Car is much quieter, and when the doors close, it has a very satisfying thud sort of like a BMW or Acura. It does add quite a bit of weight to the car though.

 

yall need to use some closed cell foam on top of the dampening mat. the mat makes the metal more dense and stops it from resonating. the foam is a sound blocker, it will get rid of exhaust and road noice from coming in and keep your music from going out. it can be baught from elemental designs, second skin, raamaudio, or vorla foam. its cheap and works great.