With Vibration damping, the more the better.As pointed out, there is a point of deminishing returns.
1 Layer of constraint layer damping mat @ .5 lbs. psi is can yield an ALF of .10 or so.
Adding a second layer of mat will crank the ALF up to about .27 or so
a 3rd layer will get you up to about .33 then .36 and so forth.
So 2 or 3 layers is ideal depending on the budget.
The more a product weighs and the thicker it is the more it will dampen vibrations too. so a 45 mil product weighing .35 lbs. psi will only yield a .06 rating..
The strength of the foil and the viscosity of the adhesive layer all contribute to the range of frequencies that will be most reduced with the product.
The more firm the adhesive the lower the frequencies will be killed.
Softer butyl or asphalt will dampen high range noise.
Hope that helps
ANT
http://www.secondskinaudio.com
Yes it does, thanks. Now I just need to wait til I get some warm weather (spring) so I can get started. Too bad I don't have an indoor facility I can do this in.//content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gifFor the majority of water based sound deadening like Spectrum you need to do at least the same thickness as mat to get the same reuslts as mats. I prefer to add a little more in order to make up for the lack of foil that the mats have..
How thick each layer is depends on how thick the coat you put on. If you use a brush, 1 layer can be about 20 mils or so on a flat surface. Upside down it might only be 10 or so.
40 mils is equal to 1 mm.
If you spray it on, you can do about 20 wet mils at a time.
Once the color changes from blue to black (or dark grey) you can add another layer.
Hope that helps
ANT
http://www.secondskinaudio.com
I'd rethink that choice.car is an acura integra coupe and im using fat mat extreme