Well, you have to realize that its original purpose is for sealing a roof. It designed to get soft and sticky with a lot of direct heat. And being that its designed to be on the roof of a house and not upside down is the other issue.
Its the same principle as the tar substance on roofing shingles. When sun hits the roof and heats it up, the tar melts and help seal the shingles to one another.
I don't remember what the stuff was called that I bought. I got it off Ebay.
More than likely it was Grace Ice water shield. I used it on top of Dynamat extreme in the trunk of my Impala to stop the rattling. It worked so well I ended up using it on the floors, rear deck, as well as doors... Smell wasn’t bad at all, and the little smell there was lasted about a week. I plan to use it again in the Buick limited I just bought. It held up pretty good on the deck upside down but as stated it wasn’t getting direct light like the roof... we’ll see what happens. I bought a big box of it from Home Depot for about 115.00 but it was enough to do my car 2 or 3 times and that was a 96 Impala.
Thanks for all the tips n such!!! For the first time I just spent all afternoon driving around in the cutass doing errands, and I defintly need to insulate this thing. Anyone else have any tips/advice??
When using a heat gun to apply it to the doors, do I line the mat up, then lift it up and heat the adhesive side and press it on, or do I line it up and heat the back of the mat and press??
On my 350Z I decided to make it as quiet as possible inside the car. I removed all the interior panels and lined the back of every panel with this thin soundproofing they use underneath artificial wood floors. It looks like the factory stuff but much thinner. I made it stick with 3M spray adhesive.
I filled every hollow part of the body with expanding foam. I even drilled holes in tight places to get the spray nozzle for the foam into the hatchback and floor supports etc. I sprayed it inside the door frames, and in the hollow support beams in the hatchback, and in the rear upper fenderwells.
After that I used this stuff called gutter repair tape. It's a tar like black ultra sticky material on one side and has a shiny metal on the other side. It seemed to be very dense material. It was about $7 a roll on sale at home depot. It doesn't smell at all. I lined the inside of the doors, I completely lined the floorboards and inside of the firewall, and the hatchback with this stuff. I removed the front plastic fenderwells and lined the back side of them. I also lined the inside of my front fenders and then reinstalled the fender wells.
Then the carpet and interior panels reinstalled covered all the materials and you can't see anything anywhere, it looks stock. Overall I added about 10 - 15 pounds but I'll never notice the extra weight, it's about the same weight as 2 gallons of gas.
The car was definitely much quieter than before, and feels more solid since there's no more echoes when you slam the door or go over bumps etc.
Thats a pretty good idea gto78, lining the panels instead of the door metal, why didnt i think of that, durrr Sounds easier to work with than the other stuff having to use a heat gun and all. Thanks!! 😀
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Sounds easier to work with than the other stuff having to use a heat gun and all. Thanks!! 
