I will let others address the roof and doors but definitely cover the firewall. I used a Dynamat type material and a new firewall mat but my dash was out to be able to access it.

 

Hello,

I also wanted my 70 El Camino to be quieter like a modern vehicle but quickly realized that achieving low Noise, Vibration and Harshness numbers is designed in from the beginning. In other words, it can't happen like a modern vehicle fifty years later.

Yet, there is much that can be done. I did Lizard Skin sound deadening on the floor / firewall and back wall of the passenger compartment with a clear coat on top of that and the aluminized adhesive rubber on top of the clear on the floors.

For the ceiling, it was clear coated and then it got the aluminized rubber. No Lizard Skin there but it could have gotten it.

The doors under the waterproof paper got the Lizard Skin, the clear coat and the aluminized rubber. I did nothing for sound deadening inside my doors but could have. I chose not to.

Rick

Sent from my SM-G965U using Tapatalk

 

I only use Second Skin for the restomods we build.

Damplifier Pro, from Second skin, is the “dynomat” equivalent. It is 30% better than dynomat at dampening sounds, noise, and vibrations. We install it on the floor pan, up the firewall, up the rear seat divider, the roof if the head liner is out, in the trunk, the rear fender wells, the trunk lid, inside the doors ect. Pretty much anywhere you can get it where it doesnt interfere with trim or panels. We go for 100% coverage when possible. Although you only need about 70% coverage to be effective at dampening road noise and vibration. The Second Skin being applied to inside the door panels is what will give your door that rock solid feeling when you close the door so it has a nice deep “thud” to it. You’ll even hear a much deeper tone when knocking on the outside of the door with your knuckles.

If you want to take it one step farther for climate control and further deadening of sound… we use Luxury Liner Pro from Second Skin. Its a padded matt you put down on the floor board, trans tunnel and firewall. This will stop ambient heat from coming thru and also keep the A/C in. Nice addition of insulation when added on top of the Damplifier Pro.

Here’s some pics of the Damplifier Pro in a ‘72 Chevelle supercharged LS3 restomod were building:

 

About how many sheets did/do you use? More than 40?

 

I used second skin as well. Loved it.

 

My goal was to lower the resonant vibrating frequency of the big areas of sheet metal in my vehicle and I think I succeeded. To do more than I note above was not worth it for me.

Rick

 

wow, that looks really good and i presume an overall great seal for noise and heat. Thanks for sharing.

 

Figured i would throw up a couple more pics of that same ‘72 chevelle and show what the Luxury Liner from Second Skin looks like. This is for insulation from the heat under the car and coming from the firewall, and also makes the A/C more efficient. There is also an added level of sound deadening as well.

 

I used Dynomat laid out as directed by the manufacture to deaden any metal harmonic but then I used 3M Thinsulate to absorb sound. Way more effective than all that extra mat. Way lighter but way more money too.

 

That second skin looks pretty neat! At a minimum, it won’t slice your hand like Dynamat will…….

Joe