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Re: sound deadening inside doors
I sprayed mine with undercoating when I did the power window install. It made a huge difference!
I first cleaned with a long brush and Dawn dish soap. Rinsed with water, dried then sprayed the undercoat. I had a bunch of cans of it and liked the Lizard Skin approach for the inaccessible areas. Took a couple of days to dry but has not come off at all. No smell. Worked great.
One thing I did was use my knuckles to "tap" everywhere on the door to find the places that resonated. I found that the window frames actually made more noise than the rest of the door. I cut small strips of the Fat mat style stuff that I had left over from the cab floor and back, to put behind the felt channel which knocked that noise down a bunch.
Whatever you end up doing, it will never be like a "new" car but will be loads better than what we have to start with.
FWIW, I did the Fat Mat style stuff to the inner and outer panel of the doors but it did fall off after a little while which created its own annoying noise.
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