In Grizz's defence, I have my trunk and a small amount of the interior deadened with rubberized gravel guard.

I've been asked more than once by judges about it and when I tell them what it is, all they say is "Oh Ok..how thick is it?"..they take a another quick look and nothing more said...And gravel guard is not a commercially available sound deadener.

Grizz has been to more than one show and judges have never said anything in respects to the deadener...not as far as I know anyway...

I don't know...myself,I'm with Grizz on this...Its not a case of whats used, its how well its used...and how safely..wire,connectors,etc...

 

I'm with Grizz too. If it works, use it. If not, try something else. But I've done enough research to realize that a lot of these 'sound deadening' product sellers are peddling snake oil. $5+/sq. ft. for vinyl with an adhesive backing is so ridiculous it's almost funny.

I have found a fairly inexpensive source (www.raamaudio.com). More than Grizz's solution (probably $2.25/sq. ft. delivered incl tax -- would be a lot cheaper if I lived in the US). But it has the adhesive already, 60mil (1/16") thick, aluminized backing. Good reviews, and excellent customer service. I'll let you know how it works out.

BTW, I wanted to go with B-Quiet (being a Canadian company and all). But $3.30/sq. ft. delivered is just too much for what appears to be the same product. And don't get me started on the cost of their foam...

[ March 22, 2005, 12:47 PM: Message edited by: sac ]

 

Contact cement holds like a mother----- so unless you skimp out I dont think youll have a problem for the next 15-20years... as far as deadening and sound absorbtion goes... The general rule is that mass that does not add to structural integrity reduces resonance.. Ie adding Xlbs per ^2" rubber matt vs asphalt mat or whatever will probably be at least compairable IMO... wouldnt be that hard to set up some tests if you really wanted to...

As far as sound absorbtion.. well thats a little diff app then most mats like the ones we are talking about tackle... Im sure it wouldnt be too hard to find something to get the job done though...

 

True. I took this into consideration when shopping around for the rubber, and I got a small piece from them first to see if I actually COULD get it to work the way I wanted it. Contact cement is just like paint... easy to see, easy to coat a surface perfectly with no bubbles. Then, you also coat what your gluing, in my case the rubber (hence; "contact" cement). Then placing the rubber was done just like placing decals on a car... using rollers and straight edges to get it all down good with no bubbles or non-glued square inches... In that second pic I posted you can see that I got it down good enough to shape to the line in the roof, something I had expected not to happen.

You won't find a stronger glue. But I would think that the type of goopy glue that some deadeners use probably has better audio qualities, since it never really dries like the contact cement.

 

Thing is, I suspect that closed-cell foam IS just closed-cell foam. Yes the BQ stuff uses a constrained layer. But you can do this yourself (or buy it from a non-car audio related source), and it will not cost $9+/sq. ft.

At the end of the day, this debate is about convenience vs. cost. I don't deny the value of the convenience, but to me the cost doesn't justify it. One must get creative to obtain similar benefits at much lower cost, but it can be done.

 

Good point.

shop rolls that have the metallic surface on the back will pull the adhesive over time because it is not flat.

It would make more sense if all Mat would come flatly laid out in a box.

 

There is no way in the world that the foil backing on a sound deadening product will cause the material to come loose from the surface it is stuck too.

The foil is not spring loaded.....once it has the form from the surface it has been applied to thats it....its not going anywhere.

 

^ I believe you misunderstanding what I am saying.

A shop roll when rolled out will have the metal surface wrinkled. Because of this it makes it very hard to uniformly bond it to any difficult surface because in essence it will pull away. This is why some manufactures lay out there product flat for shipping.

This study has been proven by the OEM suppliers I have spoken to.

If this doesnt make sense, then feel free to contact me to discuss it.