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Discussion Starter · #1 ·
I've been looking around a bunch at different materials for vibration dampening, sound absorption and sound blocking.

First and foremost, I plan to use a high quality CLD mat as the first product to fight against vibrations and panel resonance. These have been discussed in excess so that's all I'll say about it.

Second, for extra vibration damping I plan to use something a little unconventional. I've seen it used in a few places, maybe its a good or bad idea.

I found a few of these around different stores and I'm fairly sure they'll be pretty effective.

Sta-Kool -made by gardner-gibson
data sheets here:
http://www.gardner-gibson.com/files/uploads/SK7000.pdf
http://www.gardner-gibson.com/files/uploads/770_SK_TDS.pdf

< 5% ethylene glycol
< 40% polymer
10.85 lbs per gallon
52% Solids by weight
40% solids by volume




Roof Guard also made by gardner-gibson
data sheets:
http://www.gardner-gibson.com/files/uploads/5527_BJ_TDS.pdf
http://www.gardner-gibson.com/files/uploads/MSDSBJ-5527.pdf
1% ethylene glycol
< 40% acrylic polymer
56% Solids by weight


I found a few others of these but they all have polymer/ethylene glycol in a water based formula. Some have different solids content and lower full cure time.

I don't see any reason not to use the cheapest one. Opinions? Can this stuff be color-changed? I'd like to make it closer to my car color than WHITE!

Is there anything that would lead you to believe this wouldn't be effective in damping panels? (used in conjunction with CLD of course)

I have some discussion on other materials later, like some foams and blockers, but I'll hold off on that for now.
 

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Discussion Starter · #3 ·
Weight Per Gallon 10.85 lbs.
Solids by Weight 52.0%
Solids by Volume 40%
Viscosity (ASTM D-2697) 115 KU
Elongation (ASTM D-562) 250-300%
Tensile Strength (ASTM D-2370) 270 psi
Reflectivity (ASTM C-523) 89%
Permeability (ASTM D-1653) Inverted 25 perms

Seems to me that tensile strength, weight, and reflectivity makes this stuff useful.
 

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i kind of feel like a bastard here,

is there any way to estimate how well a material dampens vibrations? (i think it would be considered its "Loss factor")

http://pdf.aiaa.org/preview/CDReadyMSDM08_1875/PV2008_2238.pdf
Not really - without testing. If this is going to be a high SPL vehicle and you are looking for panel reinforcement, it might not matter. Otherwise, CLD + liquid applied whatever + barrier is overkill. CLD should be enough with a barrier.
 

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Seems like an interesting way to go. I think if its pretty close to a tar like material it would work rather well. I would almost think it would be better if it had some sort of rubber material in it. I know the trunk bed liners seem to work pretty well.
 

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Seems like an interesting way to go. I think if its pretty close to a tar like material it would work rather well. I would almost think it would be better if it had some sort of rubber material in it. I know the trunk bed liners seem to work pretty well.
Not trying to be difficult, but tar like is not what you want. You also don't want something that is purely elastic either since that returns most of the energy it receives.

For vibration damping you want something toward the elastic side of a material that is both viscous and elastic. Finding a construction product that will stiffen a panel is much easier than finding one that will damp vibration. That requires very careful formulation for a purpose completely different than any construction material's requirements. You might find such a thing, but it would be a coincidence. In CLD mats, being butyl makes it likely that the product will have sufficient heat tolerance to survive in a car, but just being butyl doesn't mean it will be a good vibration damper. There are an infinite number of butyl formulations and it takes very particular properties to do what we want.
 

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I had in mind something more like a truck bed liner material like a rhino lining. I think tar was the wrong word to use. I believe its butyl on all the dynamats and stuff like that... always just got used to calling it tar.
I know im planning on getting the Second Skin spray on spectrum then some RAA mat and then some closed cell foam like their luxury liner...
 
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