Hi Bob,
Here's what I know from experience with P & S:
It definitely cuts down on vibration = less noise in the car.
It cuts heat and is waterproof. It goes on easily, cuts with a scissors and sticks very well, provided the surface is CLEAN.
It has a heat tolerance of 150 degrees F.
I noticed a huge improvement after using it and would use it again. Probably would double-layer it now that I know it works this well. My car is quiet inside now and I can hear the radio/stereo/ipod, especially improved is the bass.
To your specific questions:
1) No, I didn't because the factory door anti-vibration panels were in great shape and I had new interior panels that are made of abs plastic sheets, molded to fit, and covered with foam padding and vinyl. The headliner was not in need of repair, thankfully. I would not hesitate to use P & S in either of those places if it was needed.
2) I used P & S over the factory vibration mats, under the rubber-fiber sound deadening mats that were a factory addition on the 164. I was fortunate to still have mine in good condition. It really adds to the overall deadening. You can see the pictures of the three layers in the Gallery. http://www.brickboard.com/GALLERY/
3) What I read about P & S and other products like it, where sound-deadening is concerned, is that they work on sound-deadening by adding mass to panels prone to vibrating, to lower the frequency the panel vibrates at. It then requires more energy to vibrate those panels, thereby deadening the sound. If the P & S is double-thick it's adding more mass, deadening more sound. If you don't have the factory anti-vibration panels there, I would double-layer it. At about $1./sq. ft., why not?
4) As I said, a heat tolerance of up to 150 degrees is certainly adequate for interior floor/firewall installations, or to seal off holes for improved A/C, etc. I noticed a definite improvement. I would think twice before using it in AZ or someplace with sustained high temps of 100+.
5) Yes.
Hope this helps, sorry for the long post.
Jack
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