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Hey
I ordered a gallon of second skin sludge to help insulate my sound, but I heard that won't help out panels rattling. I have a whole bunch of polyfill left over from when I stuffed my sub-box with it. I read through a couple of threads about sound deadening/stopping rattling, and they mention that you can use polyfill to stop the rattling. I just don't fully understand where you put it and how much you put. Any pics would be awesome.
Thanks for the help
Axel

 
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I wouldn't use polyfill to fill gaps. Sure, you theoretically use it to diffuse the sound waves, or insulate pieces from rattling (coming into contact with one another), but because of it's lack of density, it'd take a lot packed in there. I'd consider some expanding foam, such as great stuff available at home depot, to handle that task. Another alternative would be to use some jute to insulate and diffuse the sound waves. It'd be much more effective at diffusing than the polyfill.

 
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i just found a few pieces of foam from some packing and stuffed a few pieces from in the trunk.There are a few holes under the brake light where you can reach through and feel where the deck lid is. I put foam inbetween to raise it up and most of the rattle is gone.

 
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thanks man

what kind of foam is it? like this kind?:

 
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ha no not peanutds. its the kind where you press and it squishes but pops back up.

 
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Home Depot and Lowes (probably Ace hardware as well) both have insulation foam that is very lightweight and can help suppress panel rattles. I have used 1" thick foam under all plastic panels including the back deck and doors and none of my panels rattle even on the worst roads. Some of it is self adhesive, but that is more expensive. It's cheaper to buy the standard stuff and then an aerosol can of spray glue if you want to glue the stuff on. Just put it on the plastic panel side, cut out for the clips, and then it will squish down and silence the rattles. The 1" foam that I have used will compress down to no thicker than a few pieces of paper so there should be no clearance issues as long as you trim the foam for all clips.

If you want to stop metal rattles or road nosie, get a product like Accumat Damper or Dynamat and apply to the door metal, the trunk, floorboard, headliner, and any other surfaces that transmit road noise or vibration. Those products are intended to weigh down the metal and reduce the vibration that allows sound to pass through. Using Accumat or Dynamat won't stop the plastic-metal squeaks from the panels rubbing on the metal, but will stop your trunk from rattling from your sub and will make your car much quieter on the road.

 
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Read this site www.sounddeadenershowdown.com and then spend some money on the products on the site according to your budget/requirements.

The foam you are probably thinking of is the eggshell stuff, the acoustical version of the stuff is called anechoic foam, but i am sure they make a generic, non-acoustically geared version of it for packing applications or what have you.

 
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sorry for replyin late. but thanks for the help guys. Guess i'll be taking a trip down to home depot soon.