Sound mat installation challenge

[Duc Hunter]

I bought an Ultimate Sound Mat recently for my Rat Rod. The car was at my Indy to replace the front/rear window gaskets so I asked them to install the sound mat while they had the car. They said they cannot because the sonds mat has a foil back, and the car has Dynamat Xtreme foil backed sound proofing not eh firewall. They claim the glue wont hold "foil-to-foil" and I would need to remove the Dynamat, which means pulling the motor.

SO......do any of the Jedi Masters here have any suggestions on how I could install the sound mat without removing the Dynamat?

[RD911T]

I used 3m yellow super weatherstrip and gasket adhesive that Wayne recommends on my sound pad and that stuff really works. It worked so good that I used it to re-glue some door pockets on my sons M3. Besides if it will stick to foil on one side, why not both? Their reasoning doesn't hold water.

[Tremelune]

The real question is why would you want both? Either leave the dynamat and cover it with CCF and MLV, or remove it all and install the sound pad.

This is in the engine bay, correct?

[Duc Hunter]

Originally Posted by RD911T

I used 3m yellow super weatherstrip and gasket adhesive that Wayne recommends on my sound pad and that stuff really works. It worked so good that I used it to re-glue some door pockets on my sons M3. Besides if it will stick to foil on one side, why not both? Their reasoning doesn't hold water.

I agree which is why I asked here.

Originally Posted by Tremelune

The real question is why would you want both? Either leave the dynamat and cover it with CCF and MLV, or remove it all and install the sound pad.

This is in the engine bay, correct?

Yes it is. the Dynamat is just a layer of butyl rubber sandwiched between 2 layers of foil. It wont stop sound like the pad will. The Dynamat is already in the car and I am not dropping the engine just to remove it, and I already own the pad, so I thought why not get it installed if I can. Won't the engine bay sound pad work similar magic to the CCF/MLV you mention? Maybe not as good, but far better than just Dynamat?

[Tremelune]

Having never done a sound pad, I assumed the engine had to be out to get one in. Having the dynamat there certain won't hamper damping.

[Duc Hunter]

Originally Posted by Tremelune

Having never done a sound pad, I assumed the engine had to be out to get one in. Having the dynamat there certain won't hamper damping.

It is best if it is...that said it can be done. My car has a 3.6 in it, and it looks like that will make it a little easier.

[strudelwagon]

Another option would be to install it on the interior side of the firewall!
SW

[DaveMcKenz]

Just glue it in with 3M Weatherstrip Glue. It's not that difficult. It will take 30 minutes, and the glue will hold it forever.
Good luck,
Dave

[Fast Mike]

A can of carpet glue will glue the foil pad to dynamat with no problems whatsoever.

[Duc Hunter]

May give that a try this weekend. Will report back if/when I do it.

[87maniac]

This is very easy, only a few minutes with the engine in: Pad Keeper

Pad Keeper - The Solution to the Hanging Sound Pad - Rennlist Discussion Forums

[Duc Hunter]

Yeah the pad keeper part is easy. The installation of the engine pad itself over a 3.6, and attaching a foil backed pad to Daynamat extreme foil backed sound deadener is more complicated. A Pad Keeper will go in after for sure.