Four Wheeler had an article on sound deadening paint that caused me to write the manufacturer regarding our issues. Here is a response:
Dear Mr. Eusterman:
Thank you for your internet inquiry regarding noisy vehicles. I can give
you some information on the subject as it involves some of the products that
we represent and sell. First may I direct you to the September issue of "4
Wheeler" Magazine. There is a column called "Neat Stuff" where our noise
dampening product "NoiseKiller" was reviewed. This product takes the ring
out of sheet metal. If you have a sheet of metal and it gets impacted or
oscillated it will vibrate. If it vibrates with a frequency in the audible
range then we hear it. If you take a bucket and pour rocks into it there is
a tremendous clatter. If you coat the outside of the bucket with
NoiseKiller and then pour rocks into it then there is a remarkable deadening
of the clatter.
NoiseKiller's secret is its chemical make-up. It is a visco-elastic
material that will translate the vibration that normally makes noise into a
shuffling of molecules that do not return to their positions readily. The
energy is changed into heat. The result is a very small increase in
temperature ( a tenth of a degree or less ) and no noise. So for rattling
sheet metal, this is the product to use. It works well for body panels,
trunk areas, wheel wells, floorpans and such.
Your comments for lead sheathing will work, but it will dampen only by
changing the harmonic frequency a bit with the extra mass. NoiseKiller will
do the same to an extent because it also adds mass. (Specific gravity of
1.6) but it really exceeds the lead sheathing performance because of the
visco-elastis properties. I'm guessing that the lead would have to be
glued, mechanically attached or sandwiched between floorpan and carpet
somehow.
Noisekiller is water-based, not lead based.
Once cured it is waterproof
It has fairly good undercoating properties
It is heat resistant
It can be applied via undercoating spray equipment or brush or roller
It treats about 40 square feet per gallon
You can paint over it
You really do need to remove all oil and grease to make sure that this
product sticks
Try to make the distinction between air born noise and structure born noise.
NoiseKiller and lead sheathing will only attack the structure born noise.
This is a fairly long disertation regarding this product. Please feel free
to call us at Memtech and speak with me or our consultants for how to
proceed. We shuld have reprints shortly on the 4Wheeler article available
and could advise further.
Thanks, Glen Easterbrook
g_easterbrook@ameritch.net
As you can see, there is some potential here. I have written for availablity and prices and will post when received. George
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