This is the material I used to cover the inside of the dog house.
I installed it in aircraft for 40 years. It has made a great change in the noise level of the motorhome cockpit BUT that is sitting in the yard, no road test drive yet. Coming soon.
3M 4014 SOUND AND VIBRATION DAMPING PANELS
I will be installing the Fatmat under the floor in the near future and fully expect this to be a good thing.
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