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Old 03-31-2001, 10:46 PM   #1
T-REX
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World Rally blue -Sedan

Post Sound deadening?

Hi,

Anyone know where I can find some cheap sound dampening sheets? Dynamats way to expensive... Anywhere local sell brown bread?
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Old 03-31-2001, 11:48 PM   #2
alexs001
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Cool

The best thing I found for sound deadening for resonating body panels is expanding insulating foam. Go to Revy and pick up a can or two of "Great Stuff". Use it sparingly as I have heard of over expansion leading to distorted metalwork. I filled the entire tailgate of my wagon with the stuff. Once it cured, it was dead. Also, apply it in layers in larger cavities. Do it over the course of a few warm summer days. If you put too much in at once, not only do you risk it bending metal, but it also loses it's air bubbles and it goes back to being a gooey mess.

If you need something that will function as a deadening sheet, you can use contact cement and a soft flexible linoleum. Use heat gun to enhance pliablity.

Alex

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Old 03-31-2001, 11:56 PM   #3
speedracer47
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If you wanted to buy it mail-order, L-Mat is an excellent Dynomat alternative: http://www.l-mat.com

Pretty much identical at a fraction of the cost.
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Old 04-01-2001, 04:07 PM   #4
Orbiter
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u can buy cheap sound deadening material at revvy or home depot
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Old 04-01-2001, 04:51 PM   #5
T-REX
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Cool, is there a specific name for it? or just look for sound deadening stuff...
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Old 04-01-2001, 05:21 PM   #6
Orbiter
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not sure of the name but you'll see it
they come in squares.. like 8x8" sheets.
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Old 04-01-2001, 11:04 PM   #7
T-REX
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thx dude.

Is this the same stuff you used? or did you get the real deal?
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Old 11-07-2009, 02:43 AM   #8
Wrgb
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Default

Revival of dead thread (Thats right... I know how to use the search button!)

Does anyone have any alternatives now... 8 years later?
Dynamat is still expensive.
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Old 11-07-2009, 02:52 AM   #9
Necromancer
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Yeah, that's about right.

Default

Tar roofing sheets, available at Home Depot for dirt cheap.

I put them in my WRX a long time ago. Then I had to open up the door panels again to put some rubber sealant over them because -- big surprise -- they made my car smell like tar.

But they work.
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Old 11-07-2009, 03:11 AM   #10
Wrgb
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Quote:
Originally Posted by Necromancer View Post
they made my car smell like tar.


Did the sealant make it better?
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Old 11-07-2009, 12:26 PM   #11
Necromancer
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Yeah, that's about right.

Default

Yeah, I think I went with several coats of plasti-dip and the smell was pretty well covered. The smell is probably why Dynamat comes with the foil coating -- in retrospect I should have just covered it with kitchen foil. Just be careful when spraying inside the doors to avoid fouling the power window motor or mechanism. I think I went over top with another coat of some Swedish spray-on sound deadener to roughen up the surface to absorb more sound.

But this is just my guerilla and (at the time) el cheapo approach. The pros probably have more experience in this area...
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Old 11-07-2009, 12:44 PM   #12
Loomin
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you can get no-name stick on stuff from lordco or a body shop supply like "CBS" (canadan bodyshop supply). if you go to lordco make sure you go to a location with a body shop section. the one on 2nd has one

you get ALOT it comes rolled up in a box.
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Old 11-07-2009, 01:02 PM   #13
tora
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+ NA Miata

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Quote:
Originally Posted by alexs001 View Post
The best thing I found for sound deadening for resonating body panels is expanding insulating foam. Go to Revy and pick up a can or two of "Great Stuff". Use it sparingly as I have heard of over expansion leading to distorted metalwork. I filled the entire tailgate of my wagon with the stuff. Once it cured, it was dead. Also, apply it in layers in larger cavities. Do it over the course of a few warm summer days. If you put too much in at once, not only do you risk it bending metal, but it also loses it's air bubbles and it goes back to being a gooey mess.

If you need something that will function as a deadening sheet, you can use contact cement and a soft flexible linoleum. Use heat gun to enhance pliablity.

Alex
I just used this in my stripped Miata in the doors (auto windows taken out) as there was some rattling. They now shut very solidly and no more noise. Not sure how it would work in other parts of the car but if you have dead empty space I would try this. Very light and gets in where you couldn't lay sheets.
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