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Noise Killer Spray On Sound Damping - Neat Stuff

Posted in Product Reviews on September 1, 2002
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A very cheap foam brush was used to apply Noise Killer to the bare (except for paint) cargo area of a rather noisy vehicle. It greatly reduced the road noise, but in retrospect, it would have been easier to spray it on. There's enough of our gallon left to also hit the uninsulated areas of this vehicle's firewall, and there, the brush is the applicator of choice. We also brushed Noise Killer onto a fiberglass cowl and firewall, and no longer need earplugs when driving that vehicle. Next, the neighbor's dog.

Noise Killer:A Spray-on Sound DamperWith long and cold winters to endure, the Scandinavians have ample time to invent things that work, and work well. Optima batteries come to mind, but most 'wheelers probably haven't heard of Noise Killer yet, although it's been used commercially for years. Made to combat sounds you do not want to hear, Noise Killer is a water-based, soupy substance that can be sprayed or brushed onto just about any surface that transmits unwanted noise (sorry folks, that does not include spouses).

Traditional sound-damping technology works on the principle of absorbing noise in heavy and dense materials such as lead, but the lightweight Noise Killer simply transforms the sound waves into heat-not enough to make a measurable increase in temperature, but apparently enough to insulate engine and road noise quite well. Once the non-toxic compound is sufficiently cured, which takes 24-48 hours, Noise Killer dampens vibrations on plastic, glass, metal and fiberglass surfaces. Prep is minimal, and just getting the grease and the worst dust and crud off before applying seems to be sufficient. It doesn't smell much when applied and what little smell there is, goes away fast. Depending on temperature, Noise Killer is often dry to the touch after just a couple of minutes. It starts out a light gray color and quickly turns to a darker gray as it dries. When fully cured, the coating is waterproof, can supposedly be painted over with most any one-component paint, and it can be used as an undercoating.

We tried this sound-damping material on a fiberglass firewall and cowl, plus in an uncarpeted cargo area, and found that applying Noise Killer with a brush is far quicker than it is to cut and glue pieces of traditional damping materials onto them. It's really easy to brush the Noise Killer on where there's a lot of wiring and other obstructions to work around, then clean things up with a wet rag afterwards. On larger, unobstructed and easily masked surfaces, it would make sense to use a sprayer.

Noise Killer is very affordable at about $40 for a gallon (three- and five-gallon sizes are also available) and goes a long way even when applied according to instructions, which specify using at least two coats.


Memtech Inc. Acoustical Div.
Plymouth, MI 48170

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