Introduction: Install Sound Deadening Material in Your Car! (fake Dyna Mat) to Make Your Car Sterio Sound Awesome!

Picture of Install Sound Deadening Material in Your Car! (fake Dyna Mat) to Make Your Car Sterio Sound Awesome!

ever see something that's all packaged nicely and sold for an exorbitant sum and think to yourself. "I could make that!" or "that's just _______ in a shiny package!" that's what I did one day when looking for sound deadening material for my car. Dyna mat is a really great product that really cuts down on road noise, body noise/reverb  from your awesome system and other annoying sounds in a car. The thing is that it's expensive! I realized that dyna mat is actually sold at Home Depot for a completely different purpose! it's used as a flashing material on house roofs!
the HomeDesperate sells the stuff for 20 bux a roll vs dyna mat's $100!

Step 1: First Step Peel It Off the Roll.

Picture of First Step Peel It Off the Roll.

I'm a little slow sometimes so it took me a minute to figure out how to get it off the roll. Now is also the time to make sure your surface is clean!

Step 2: Cut the Piece to Size

Picture of Cut the Piece to Size

I tried knives and my built-in bionic eye laser to cut the stuff but I found that a old pair of scissors worked the best to cut the junk. it's got tar on the back side of this stuff so the scissors may get a bit gummy by the end of this.

Step 3: Peel the Backing Off and Start Smoting It Down

Picture of Peel the Backing Off and Start Smoting It Down

I used this special roller thingie to press the stuff down into all the nooks and crannies. it worked good. I don't know where the roller thingie came from. maybe from a magic toolchest or something. in fact it may be the only one like it on earth... but it worked great.

Step 4: Do That All Over the Place.

Picture of Do That All Over the Place.

it doesnt' have to look perfect cuz usually it's covered over by something. like.......

Step 5: ...CARPET!!!!

Picture of ...CARPET!!!!

Now just to do the rest of the floor area, inside the doors and stuff....


ManD4 (author)2016-02-01

Just a heads up, but the roof repair tape is an asphalt product and dynamat is a rubber product. The net effect for sound deadening is not wildly different, its true, but the asphalt tape will off gas cancerous fumes. Not saying you shouldn't go for it, but recommending the asphalt tape as a direct replacement is not accurate or healthy.

josh (author)ManD42016-02-08

Thanks for the comment ManD4

I Looked up the MSDS on AlumiBond, it has 0 VOC and:

"solids formulation of synthetic resins, thermoplastics and non-curing rubber"

it's available here:

I prefer to use that brand as it's a little more rubbery

The U-Seal featured in the picture has very similar properties.

You can find the MSDS for U-Seal here if you're concerned. -

Just for spits and googles, I googled the MSDS for Dynamat. this is what popped up:

it seems to have the same active ingredients as the U-seal. (and other ingredients that pose potential (but unlikely) hazards

An aside: From the factory the VW beetle came with asphalt sound deadening material allover the interior of the vehicle, we removed them in the restoration. There is no smell in the vehicle and it does not seem to move around in hot weather.

Is it a direct replacement? no....ish

for all intents and purposes, it's the same. I try to do the requisite research and I'm sorry I didn't lay it all out in my Instructable.

Welcome to the community and I hope you'll share some of your projects with us as well!


ManD4 (author)josh2017-12-14

Right on, Josh. I apologize for assuming otherwise. There have been a lot of people passing off some nasty stuff as Sound matt lately, so please forgive my vigalence. Your due dilagence is refreshing. Thanks.

corski67 (author)josh2017-12-07

Just the facts... Nicely done. I enjoy reading these comments sometimes just to look for the inevetible naysayer; warning of impending death and mayhem for those who follow the instructable. Rarely do thse folks include any facts... but rather just their opinion. You've done a nice job of answering the "concern."

josh (author)corski672017-12-14


BobL124 (author)2017-05-30

Dyna Mat is 1.7 mm thick. The product in the first link given is only 0.508 mm (20 mil) thick. How many layers would be needed for a competition mobile auto installation running 2K watts RMS into four 12" subs?

LidiaC4 (author)2016-04-19

How many of the 6''x25' rolls did you end up using?

josh (author)LidiaC42016-05-03

I think I used 2 for the entire car including the frunk

jason.reece.90 (author)2014-11-20

Ice and water guard does the same exact thing and it comes in much wider sheets. I have used that in many a vehicle and it works great!

josh (author)jason.reece.902016-02-08

I'll have to check that out! thanks!

AlB9 (author)2015-10-26

What happens on a hot day? Does black bitchumen see out the doors!!?

josh (author)AlB92016-02-08

Hi AIB9, thanks for the comment, the backing seems not to move at all and the car is in Arizona. I'd say it's pretty well stuck down and isn't moving anytime soon. welcome to the community, I hope you'll share some of your projects with us soon!

mcreynol (author)AlB92015-12-24

Normal temps won't make it run, however the part on the other side of the firewall from the turbo did get gooey. A reflective barrier on the engine side fixed that.

firecrossbow (author)2015-11-09

Does the tar smell when it get hot in side the car?

mcreynol (author)firecrossbow2015-12-24

Not in my experience, and I've taken the vehicle to very hot areas.

corbinearl (author)2013-07-16

I'm assuming this worked and you didn't explode and die or something?

josh (author)corbinearl2013-12-27

So it's been over a year and We've had no problems with the fake dynamat. in fact it has been a great material. no odor no problems. Other bug owners like that my bug is so much quieter that they've asked me to put it in their cars.

josh (author)2013-07-16

No explosions or death yet! It's made a huge difference in interior volume level... Can actually hold a conversation now.

Ranie-K (author)2012-11-27

Great idea! Probably good for silencing a desktop computer case, too! Who (if any) has tried sticking this stuff all over the inside of a desktop computer case?

dchall8 (author)Ranie-K2012-11-28

If the fan is making noise, you likely need a new fan. If the case is vibrating for some reason, any putty material will damp the vibration. You do not need to cover the entire case. I keep some office supply putty handy to stick paper to various objects when I need to . Start putting putty in quarter-sized pieces in various patterns around the outside of the case. If you get no improvement, then something else is vibrating.

rimar2000 (author)Ranie-K2012-11-27

I improved a bit the noise in my desktop sticking pieces of mop in the inner. The mop absorbs some of the noise made by the coolers.

Ranie-K (author)rimar20002012-11-28

I've stuck cork and sound foam on the inside of my computer case with a tiny bit of success, but this stuff is probably much better, since it is heavy and uses that instead of diffusing/reflecting. About the heat-sink bit that nathangill mentioned: Yes, the case is a heat-sink, and whatever you stick to it on the inside will not affect air-stream on the outside of the case (where air temperature should be cooler than on the inside), so I wouldn't be worried, since the PSU (that is a major heat source) is bolted to the case and should therefor transfer much heat easily.

nathangill (author)Ranie-K2012-11-27

I'd be really careful about this - even though the fans move new air through the case, the metal case should still be treated as an important heat sink. Give it a shot, but keep an eye on the temp inside the case.

caitlinsdad (author)2012-11-28

I've used that stuff to repair roof leaks. The mastic or thick black layer may be made of some tar-like product. When exposed to extreme heat, it will get gooey and offgas a smell if you use it in an enclosed area. Once you stick it, it will be difficult to remove.

josh (author)caitlinsdad2012-11-28

Yea. That is a good point. It is difficult to remove. Generally people who install it should not expect it to remove it. (Please dont install it on amazing one of a kind classic cars... Do it for the kids) it is a rubberized asphalt. I've installed dynamat and aside from logos printed on the product it appears to be identical. As for off-gassing it seems not to be a problem. I live in the Desert Southwest and this stuff seems to hold up well. My new carpet, headliner, glue, vinyl seats and rubber seals off-gas much more than this stuff, and this is sealed between a body panel and the aluminum backing.

caitlinsdad (author)josh2012-11-28

Nothing more intriguing than that new car smell. I think they have that as an air freshener scent.

About This Instructable




Bio: Traveler
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