Dynamat - Sound Deadening - And Alternatives

[SuperK]

what kind of hard to get spots?

I mean, the sheets will cover just about EVERYTHING. I am talking about...

just about EVERYTHING!

All those nooks and crannies that look kinda troublesome, just cut out puzzle pieces and slap it on there. If you're creative, you can cover...

just about EVERYTHING!

At least I did. No spray needed.

You can do the outer and inner door panels just fine, the trunk area can get full coverage just fine... I am not exactly sure why you would need a spray-in for it.

By the way, I ordered my second roll of b-quiet already.

1 roll covered trunk, rear quarter panels and 1 door.
The door got treated with both inner and outer panels, completely full coverage.

50 square feet didn't go a long way after all... And I'm doubling up on the trunk area.

Might take 3 rolls to finish it all!

[nolig2278]

hard spots could be rear fender wells, under door sill.

can the b-quiet stuff get wet or do i need to get carpet over it?
and do i have to take care of my small leak before putting it in?
it should be fine to put on a spray painted floor right?

thanks

[SuperK]

wash the metal with a mild degergent. Oils aren't your friend.

It's a supercharged butyl based adhesive... you can call it "hi-tech tar"

You want it to adhere first, but once it does, you'll be hard-pressed to get it off.

[nolig2278]

any every research if this "high tech tar" is safe to breath?

[SuperK]

um... it doesn't release any toxins or chemicals in the air. Not like that roofing mess, it doesn't contaminate the air.

[nolig2278]

I am installing bquiet ultimate now in the seating area. Trunk has 2 layers of brown bread from yrs ago.

Anyone think 1 layer is enough or should i prepare for 2 or maybe the insulation tape as 2nd layer?

to save money i could use reflectix in doors and under seats? or not worth trying to save?

[Ryan]

Does anyone know roughly how many square feet the MX3 has? I'm thinking entire hatch space, rear wheel wells, doors and floors?

[SuperK]

roughly... a lot!

It depends on how thoroughly you want to cover.

I did both inner and outer panels of the doors and the entire hatch area. It used both rolls and I barely finished.
I'd say if you're doing COMPLETE coverage, 150 sq ft would do it.

I also doubled up on some trouble areas. theoretically, two layers of sound deadening gives 3 times the dampening performance. If you're unsure of whether this is valuable or not, do one layer, tap on the surface, then try two and tap again. If it's worth it to you, double up.

I doubled up, myself.

[shameem]

I am thinking about trying this - http://quietcoat.stores.yahoo.net/index.html" onclick="window.open(this.href);return false; or this - http://www.fatmat.com/bulk/fatmat/100.html" onclick="window.open(this.href);return false; - anyone have any experience?

[nolig2278]

I have used almost the entire 50 sq ft of bquiet ultimate to do just the inside floor, under seats and over gas tank - 1 layer with minimal overlap

trunk already had brown bread

true test - wife says it is quieter and that is still without carpet, i used some duct tape to cover over edges to prevent mess on shoes and clothes until i decide if another layer is needed

lows from sub sound better

still thinking about another layer of something.

[SuperK]

I am thinking about trying this - http://quietcoat.stores.yahoo.net/index.html" onclick="window.open(this.href);return false; or this - http://www.fatmat.com/bulk/fatmat/100.html" onclick="window.open(this.href);return false; - anyone have any experience?

That quietcoat is erm... a rebranded underspray product? layed on thick... really.

Chew's used that method, and he claims it works well.

I'm using a new innovative truck bed sprayable liner called REFLEX. You might want to look into it. They lay it on 1/4 inch thick.

How did this work out for you chew*? Ease of installing?, Noticeable soundproofing differences? Before and after?

Ease of installing is dropping off the car and getting it back the same day, Providing that you gut the interior before dropping off. It cost a little bit more since they had to mask off a lot more stuff and add to the fact they thought i was nuts. Noticable differences were huge as far as sound quality goes. SPL hasn't been measured as my meter maxxes out at 150db and i peg 150db before and after application. Cost is less than full dynamat coverage and the coverage is better than dynamat as obviously spray can get into crevices that dynamat just can't be crammed in. Here's a link.

http://www.reflextruckliners.com/Reflex/Default.aspx" onclick="window.open(this.href);return false;

I can also vouch for using underspray materials to dampen sounds and vibrations.

I have two identical computer cases. I dismantled one and used an underbody spray aerosol and covered all the interior panels with it.

case without dampening:




Door with the spray, and without:




Case with the spray:




so they're not the same crap in the pictures, but when I was painting/coating one case,I had the setup in the other case.
When I switched cases, the difference is amazing. Cuts the high frequencies mostly, and quiets the lows a bit as well.

So the theoretical gains should be the same in an automobile, if you do the application right.

[SuperK]

I also did a bit of research on viscoelastic materials, the mats and sound deadening in general...

From my understanding of my own personal research, it seems these sound deadening techniques we're using - butyl based adhesives/asphalt based materials, their largest contribution is converting sound waves and vibrations into heat or energy, but it's only transferring certain frequencies and not others.

There is another method of sound dampening, sometimes referred to as baffling. Common baffling would be something like insulation or carpet padding, where it reflects or simply absorbs sound.

It might be worthwhile to do a basic sound deadening job by pads/sprays and also follow up with some type of insulation. Fill between the panels with some type of foam/insulation (preferrably not fiberglass... you don't want to be inhaling that stuff!) or lay some of that under-carpet foam under the carpet.

[shameem]

I looked at a lot of products and right now i am leaning more towards the quietcar thing - they have more details about the product here - http://www.quietcoat.com/" onclick="window.open(this.href);return false; - their graphs and videos look good - but i dont know how much of it is truth/hype.......

[nolig2278]

I looked at a lot of products and right now i am leaning more towards the quietcar thing - they have more details about the product here - http://www.quietcoat.com/" onclick="window.open(this.href);return false; - their graphs and videos look good - but i dont know how much of it is truth/hype.......

is that for in or under?
if in, you need to find out if it off gases anything- toxin, carcinogens

the peel and stick stuff at least has alumnum to keep fumes if any down if u seal the edges.

anyone use undercoat from duplicolor for say the wheel wells - outside?

[SuperK]

Try the quietcar, tell us how it works out!

I don't see it being much different than any rubberized undercoating spray. For goodness sakes, they're both viscoelastic materials... It sounds like a rebranded undercoating really... but if it works, it works, right?

I personally think quietcar is a bit of a gimmick... I mean, it'll work... work as good as a bedliner kit or whatever other rubberized spray is out there, but seriously... to use a gong and a cymbal as "proof" that this works is ridiculous. You can hold one edge of the gong with your thumb and index finger and almost get the same effect.

Maybe I should start selling fingers and thumbs as sound deadening material...