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possible cheap sound dampener?

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  • possible cheap sound dampener?

    hey guys, new here but been reading all of your posts for a while working on my own project. Im working on the sound in the car and ive seen alot of peel and seal, all the name brand stuff etc. I looked on ebay and found a 9"x75' for 20 shipped.

    i was hoping someone could tell me something about this, like if it would melt, smell, or if its even the right stuff, theres nashua 6"x75' for 21 at my local home depot, but thats the only real brand my HD carries.
    hopefully this is in the right section.... i just went with general, my apologies if its not right.

  • #2
    that stuff won't work.. it's too thin.

    most of the products that most use for cars increase the weight of panels, thereby decreasing the panels resonant frequency, and will also increasing the amount of force needed to vibrate the panel..

    here-- just the first part of this site goes into more detail on it:
    My OLD 2001 Mitsubishi Eclipse GT:
    "The Project That Never Ended, until it did"

    next project? subaru brz
    carpc undecided


    • #3
      that site seems to make all peel and seal seem like a bad idea, would going with a closed cell foam be a better idea? How about those spray in bedliners/undercoatings? Ive got lots of questions because ive been racking my brain for the right solution, i dont want to end up with a tarry mess in my panels because i didnt figure everything out first.


      • #4
        I actually used this back in 1998 on a Mitsubishi FTO.

        From my personal experience it actually did a very good job of getting rid of the harsh, tinny frequencies from the exhaust which were being trasferred via the boot, rear seat and floor panels. It was particularly noticable later when driving a friends identical model.

        I kept that car for a further 11 years with none smell or melting problems you queried.

        Tips if you go ahead:

        1: The adhesive sometimes isn't the greatest, but it's good enough providing the surface is clean and dry before applying, I rubbed the panels down with isopropyl alcohol first.

        2: Fit it when it's warm, and leave the material somewhere warm for a few hours beforehand. This helps it bend easily to fit the panel shape. I also used a a wallpaper edging roller for extra pressure which also ensures the adhesive gets a good purchase.

        3: Keep applying as many layers as you feel you need, I used between 1 and 3 depending on how thin and unsupported the panels were. Although they are thin (1mm) they are very dense and acoustically dead.
        Project F.T.P.C.


        • #5
          For best soundproofing you need both mass loading and sound absorbing layers. Stuff like that and asphalt based sheets are only good to help reduce vibrations but do very little in terms of absorbing noise. To absorb noise, a cheap solution would be jute based carpet underlay material.