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Old 01-05-2021, 12:19 AM   #1
hardtimes
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Default Sound deadening Q ?

Ive got a roadster that has a nasty hollow ring sound.
Have any of you successfully used material to “deaden” / eliminate this tinny sound. What material to use for best results.
BTW... no interior yet.

Last edited by hardtimes; 01-05-2021 at 12:20 AM. Reason: Zzzz
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Old 01-05-2021, 01:30 AM   #2
BRENT in 10-uh-C
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Default Re: Sound deadening Q ?

Dynamat is a great product for this.
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Old 01-05-2021, 02:44 AM   #3
hardtimes
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Default Re: Sound deadening Q ?

Thanks.
There is a ‘bed liner’ spray that is super tough. Ive used it in trucck beds. Bullet proof strong.
Wondering if anyone has tried this. It is used as under coating to protect bottom surfaces.
Is there more than one grade dynamat ?
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Old 01-05-2021, 05:03 AM   #4
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Default Re: Sound deadening Q ?

There are Dynamat competitors, also.
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Old 01-05-2021, 05:42 AM   #5
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Default Re: Sound deadening Q ?

I use the silver roof or air duct insulation material. Comes in a roll and is super sticky on one side.
Buy it at Lowe's. I've used it on A's and old VW's. It works.
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Old 01-05-2021, 07:46 AM   #6
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Default Re: Sound deadening Q ?

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I have the Dynamat in my car and I can report no drumming or ringing sound.
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Old 01-05-2021, 08:24 AM   #7
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Default Re: Sound deadening Q ?

Dynamat comes in different thickness's I believe. At least when I did my car a few years it did. There is also a product called lizard skin which is supposed to be very good. Both are expensive, I have also heard of people doing what Wick did as well with good results.
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Old 01-05-2021, 08:52 AM   #8
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Default Re: Sound deadening Q ?

The science of sound deadening body panels is to change their mass. This can be done by adding weight using roofing starter course material which is sticky on one side. The photos show this technique in my 190A. This technique is less expensive than using mat materials.
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Old 01-05-2021, 09:16 AM   #9
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Default Re: Sound deadening Q ?

I installed a cowl insulation kit from QuietRide Solutions on my ‘31 roadster, and also installed a firewall insulated panel available from most vendors. I also used dynamat on the underside of the floorboard above the muffler, and covered this with 1/16” aluminum metal sheeting. Insulating these areas made an immediate and very noticeable decrease in noise and heat inside the car.
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Old 01-05-2021, 09:24 AM   #10
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Default Re: Sound deadening Q ?

Noico is way cheaper than dynamat, adheres as good and is very effective.. the roofing material can droop in hot weather conditions.
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Old 01-05-2021, 09:56 AM   #11
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Default Re: Sound deadening Q ?

Removed duplicate post

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Old 01-05-2021, 10:00 AM   #12
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Default Re: Sound deadening Q ?

Quote:
Originally Posted by Wick View Post
I use the silver roof or air duct insulation material. Comes in a roll and is super sticky on one side.
Buy it at Lowe's. I've used it on A's and old VW's. It works.
Peel and Seal from Lowes. 3 layers in doors and 2 most other areas.
You need to use it when fairly warm

It's sticky stuff so you pretty much get once chance. I cleaned surfaces with rubbing alcohol and applied in manageable lengths of 12" or so. Peel backing a bit at one end of a strip and remove from behind as you press the strip in place. I then used a J-Roller and wallpaper seam roller and covered all seams with foil tape.

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Old 01-05-2021, 12:15 PM   #13
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Default Re: Sound deadening Q ?

I have not used Dynamat, but have used Fatmat, and Killmat, in one car, two pickups, and a motor home. The killmat was 50 mil, the fat mat 60 mil. They make a big difference. I think I actually prefer killmat. Even though it is thinner, it works well and comes in 10x16 sheets instead of a roll. It seems to be the stickiest as well. I used deadener in the complete floor pan of my roadster, including on top of the floor boards.
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Old 01-05-2021, 12:53 PM   #14
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Default Re: Sound deadening Q ?

I just installed Vibro Solutions sound deadening mat because it is made in USA. I covered most of the body metal surfaces in the doors, inside of the cowl, and around the back surfaces (Tudor). It made a fantastic improvement in the sound level and made the doors sound nice and solid when closed.
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Old 01-05-2021, 01:02 PM   #15
BRENT in 10-uh-C
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Default Re: Sound deadening Q ?

Quote:
Originally Posted by Bob Bidonde View Post
The science of sound deadening body panels is to change their mass. This can be done by adding weight using roofing starter course material which is sticky on one side. The photos show this technique in my 190A. This technique is less expensive than using mat materials.
Great thought. I guess an even cheaper way to change the mass of those body panels would be by plastering large globs of Bondo onto the inside of those panels!!
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Old 01-05-2021, 01:25 PM   #16
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Default Re: Sound deadening Q ?

Bob, in #8, you have a modified plastic container as a work tray. Clever.
As a 20 year waterproofer, I have thought the aluminum backed deadener might trap moisture next to the body metal over time. I guess full adhesion is the best answer to this possibility.
I have no experience sound deadening the model a, so ignore my thoughts, just that the sound of a model a door closing like an old icebox would be worth it.
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Old 01-05-2021, 07:22 PM   #17
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Default Re: Sound deadening Q ?

I used a 3M sound deadener, product PN, 08840. It comes in 19"x19" self sticking, paintable, squares and ten in a box. It's $75 for a box of 10, a heck of a lot cheaper than Dynamat. One box is probably enough for 2 Model A's.
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Old 01-05-2021, 10:52 PM   #18
hardtimes
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Default Re: Sound deadening Q ?

Some different and good ideas given !
Ill have to do some research on what you guys gave.
How can insulation be installed inside roadster doors ?

note:
In past, I've found that the firewall insulator...sold commercially...did a good job !

Last edited by hardtimes; 01-12-2021 at 02:43 PM. Reason: ............
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Old 01-06-2021, 12:18 AM   #19
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Default Re: Sound deadening Q ?

I have used Dynamat, but more recently I have been using RoadKill. I have to order Dynamat and pay freight to get it here. RoadKill I can get locally. It is actually a little easier to work with and does a good job.
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Old 01-06-2021, 12:43 AM   #20
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Default Re: Sound deadening Q ?

Bob Bidonde's photos are a perfect example of how to apply any decent "deadener". You don't need to coat the entire door skin, roof, etc., small strips will suffice. Knock on the sheetmetal with your knuckles and you'll hear the difference. A little goes a long way.
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