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Old 04-16-2001, 09:51 AM   #1
Alex RS
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Question Lightest (and cheapest) sound deadening material?

I want to "sound proof" my car by sound deadening ALL of it. The thing is, I don't what it to weight a ton after I apply all the stuff! I know with any kind of material. it will add some weight, that's why I what to find the lightest kind. Any suggestion?
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Old 04-16-2001, 10:27 AM   #2
25psi
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Sound deadening spray is a way to go for you then.

Try http://noisekiller.com/ That is where I am will be getting my spray from.

Eugene
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Old 04-16-2001, 10:31 AM   #3
Fitz
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www.ubid.com has been having some killer deals lately on a bunch of sound deadening products.

Fitz
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Old 04-16-2001, 06:10 PM   #4
Billy
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I believe Cascade VB-2 is the least dense of all the premier dampeners.
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Old 04-16-2001, 08:13 PM   #5
Billy
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As for the least expensive that would be some sort of ice guard roofing material you may be able to source from Home Depot... I got about 90sq.ft for about $50CAN.

Of course those items aren't specifically designed for the rigours of automotive sound deadening use and may droop/bunch in vertical applications or fall off altogether in horizontal applications.

If it's performance oriented then cheap and light simply do not go together and in this case, it's exactly the same thing. The best is probably Dynamat Extreme but it's also darn pricey.
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Old 04-17-2001, 12:14 AM   #6
Fusion
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b-quiet and brownbread are pretty light and can be bought for much cheaper than dynamat. I put brownbread in mine and the whole 70sq.ft. roll cost about $150 (includes shipping).
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Old 04-28-2001, 07:13 AM   #7
etam
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Hi Billy,

What's the exact product name that I can get from Home Depot? After I got the brullen exhaust, the rear (only) seat passenger compliants that it is too loud. I am thinking to get some cheap sound deaden in the trunk.

thx,

Ernest
bo550@yahoo.com
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Old 04-28-2001, 11:23 AM   #8
Billy
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Hey Ernest, how ya doing? The product is called Mini Pro Guard and I purchased about 90sq.ft of it for just a touch over $50 (don't remember if that was before or after tax) from a Home Depot store in Toronto. It comes in a box so you have to buy at least 90sq.ft which is quite a bit.

I would only recommend this for use on your trunk floor or in the cabin floor. I would defintely not use this in the doors, trunk lids or roof/headliner. Heard stories about this stuff just crashing down into the cabin when people were driving, scary stuff!

Check it out an HD or if you want I can bring some out to the next Toronto Meet!
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Old 04-28-2001, 02:15 PM   #9
T-REX
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Also try

Hi-Temp Mastic from www.mcmaster.com

Part Number: 9709T18

I just received some, did my doors and parts in the trunk. Seems to work very well. Very east to apply.
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Old 04-28-2001, 03:33 PM   #10
Billy
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McMaster Hi-Temp mastic is ok too... more like Dynamat (some swear it's exactly the same just without the silk screening) and less like raw roofing material.

It's OK and will work in vertical applications but kind of smells after being applied. I have some in my RS now.
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Old 04-28-2001, 08:05 PM   #11
Jeb
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Scap head liner material purchased at your local automotive fabric shop is a cheap and very light sound absorber. Just spray glue it on to the backs of your door, side, and trunk panells. Helps with scweeks and rattles by making a gasket to isolate metal from panells.
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Old 04-28-2001, 08:22 PM   #12
CosmoTheCat
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By far the lightest and cheapest (and easiest) sound deadening material is Charmin Ultra. Two squares of that stuff neatly crumpled and placed in your ear should do the trick.
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Old 04-28-2001, 09:19 PM   #13
etam
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Hi Billy,

You still have mini pro guard leftover? Can I buy it off you? All I want is cover up the trunk. Email me.

thx,

Ernest
bo550@yahoo.com
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Old 04-29-2001, 03:54 AM   #14
SubieStu
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Someone mentioned the hi-temp mastic at McMaster-Carr. I used it for the first layer of my floor pan (second layer was mass-loaded vinyl barrier over a foam decoupler). But for the doors I switched to the viscoelastic (p/n 9709T26) and liked it much better. It's thinner, lighter, has much better adhesive, and has a better dampening loss factor. With a heat gun it was easily formed. It's 2-1/3 times more expensive than the hi-temp mastic but I think it's a nice compromise among performance, lightness, and value.

Stewart
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Old 04-30-2001, 05:49 AM   #15
Siper2
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Nice one Horatio.

I would say some kind of heavy foam/rubber or something that you could get from Home Depot. Density-wise it'd probably weigh less than a full carload of Dynamat...
But listen to all these other guys, they've good ideas so far.

What I wonder is, if trying to sound-deaden doors only for road noise, would Dynamat Extreme be better than regular Dynamat?
The Extreme certainly sticks better (I have it in my trunk), is thinner and has better sound/shock protection, but.... for somethin' like road noise, would the thicker, old stuff be better?

-S2-
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