Well today I started to work on this. Stripped the trunk. Swept out all the junk.
There you can see what "sound dampner" the factory has installed. I intend to go right over this. Already have at the drivers side...
Heres the trunk lid:
Note you need to make some cuts to relieve the material to get it to stick TIGHT to the metal. If its not tight to the metal its not doing anything for you.
My car has some "goop" on it. I think its the rust protection crap they put on aftermarket... Its like wax...
I used a razor blade to scrape most of it away. Then Brake Cleaner to get it gone. Once clean and dry I use a dewaxing/degrasing agent you use before painting a body panel. Gets all the crap off without cutting the paint like other solvents might.
Heres that same area but clean:
