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Install Steps

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Step 2


Damplifier & Damplifier Pro CLD Sound Deadening Mats or Spectrum Liquid Sound Deadener

The first step in any automotive sound deadening project is using a Constraint Layer Vibration Damper - CLD.  Apply one of our foil backed CLD sound deadening mats to automotive sheet metal of doors, floor, walls, panels, trunk, firewall, ceiling, and hood to destroy resonance that leads to unwanted road, engine, SPL vibration and exhaust noise. Our Spectrum liquid sound deadener will perform as well as the 2mm thick Damplifier Pro when the Spectrum is built up to a 3mm thickness (achieved with 2-3 coats). Per square foot our Damplifier mats give you more sound deadening material for your dollar than any other auto insulation company out there. When it comes to constraint layer damping mats,; nothing compares! 

American made with high quality butyl rubber Damplifier & Damplifier Pro automotive CLD sound deadener will increase the volume of your music by keeping the acoustical energy in the car rather than letting it escape through the vibrating panels. Sound Pressure Levels (SPL) / volume inside the car increases while nasty panel resonance outside the car is eliminated. Sound deadening makes everything more solid, and sound better and is proven to increase sound pressure levels (SPL) inside the cabin.

Before applying the CLD layer, make sure to clean the metal with denatured alcohol. If you use a degreaser you will need to clean the film left behind off with soapy water and than wipe down the surface with denatured alcohol for best adhesion. Trace out the area you are applying product to with cardboard or paper and than transfer that to the butyl Damplifier sheets to cut out a perfect fitting piece (or freehand it). Place the piece in the desired location with wax paper still on the butyl sheet to make sure it will fit, as the butyl is very sticky and once the wax paper is removed it will adhere to surfaces for a permanent bond. Now, remove the wax paper and place the butyl sheet down upon the surface, working your way from one side to the other or from the center out to the edges. Once placed down, take your wooden hand roller and push the butyl sheet to the metal to form a nice bond over the entire sheet. If you have a concave, groove, and/or ridges you want to work the product down and up those valleys with the wooden roller or the back side of the wooden roller for the smaller dips. 

For coverage recommendations, the science says 60% coverage of a metal surface (with a high quality butyl rubber) will result in 95% effectiveness. With this method we suggest spreading the product out in a checker board fashion to achieve 60% overall coverage (not just the easiest 60% available). Now the problem with this method is that there is no way to tell which pieces of metal are going to resonate more so it is a guessing game of sorts. So with all the work it takes to remove the interior to apply these products, we at Second Skin do as close to complete coverage as possible on builds we are a part of, so we do not miss any annoying structure borne noises. Our motto is, do it right once, because we don't have time to do it a second time!!! 

So when you work your way across an area, you can over lap the edges or but them up to each other. Here are a few pics of the steps of adding the CLD layer onto metal surfaces, topped off with our high temperature resistant Heat Wave Pro heat and noise barrier (used on hoods & firewalls):

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Luxury Liner & Luxury Liner Pro - Mass Loaded Vinyl Barriers - MLV

After damping the automotive vibrations and cars structure borne noise with our Damplifier, Damplifier Pro, or Spectrum you can move on to the next problem; airborne noise like engine hum, exhaust drone, or outside ambient waves. This may be used on doors, floor, trunk, cabin side firewall, and wheel wells, just can't be used on ceilings, hoods, or trunk lids as they are too heavy to be used upside down (Do not use Luxury Liner Pro in engine bays or near heat sources). Our Luxury Liner and Luxury Liner Pro series MLV noise barriers block out the noise that automotive vibration damping mats are unable to handle. If you`re looking to achieve luxury car silence and automotive acoustic comfort, apply a layer of our Luxury Liner Pro MLV noise barrier mats on top of your Damplifier, Damplifier Pro, or Spectrum to create tomb like silence! 

The difference between Luxury Liner and Luxury Liner Pro Mass Loaded Vinyl products is; Luxury Liner is only raw virgin mass loaded vinyl 1/8” thick and weighs 11 lbs per 9 sqft sheet. When using Luxury Liner you will need to use a closed cell foam like Over Kill or Over Kill Pro in between the top of the vibration dampener and the Luxury Liner. Keep in mind, Luxury Liner is a raw vinyl and requires special vinyl adhesive such as HH-66 or Acrylic Tape. While Luxury Liner Pro has a very dense closed cell foam on one side and mass loaded vinyl on the other infused in one sheet that is ¼” thick and weighs 9 lbs per sqft sheet. Luxury Liner is a noise/mass barrier layer and Luxury Liner Pro is a noise decoupler/mass barrier/thermal insulator layer all in one. As far as mass loaded barrier layers go, Luxury Liner is at the top of the premium sound dampening world. 

When using Luxury Liner Pro the grey closed cell foam side goes down against the metal/foil and the raw vinyl side will be showing. To do its job Luxury Liner Pro does not need to be adhered to do its job, we just adhere the product to keep it from moving around. With both Luxury Liner and Luxury Liner Pro the goal is to achieve as much of a solid, seamless layer as possible to stop the air borne waves. You do not want to leave gaps or large holes in this layer. The foam side of the Luxury Liner Pro can be adhered to the metal/foil with High Temp Spray Adhesive or Industrial Strength Velcro with no issues. The vinyl side of the Luxury Liner Pro will require special vinyl adhesive like HH-66 or Acrylic Tape

Luxury Liner or Luxury Liner Pro can be cut with a razor blade and applied in the largest areas first. When applying the high temp spray adhesive to the product you want to spray both the foam of the LLP and the top side of the foil, wait 60-90 seconds for the glue to tack up and then push the product onto the foil/metal. Hold in place for a few minutes until it feels secure. Once the large areas are covered, go back and cut pieces to fit inside of the small areas that product still needs to be applied to. Once cut and applied, take Foil Tape and cover all the seams and corners to prevent air borne noise from getting through.

For ceilings, hoods, and trunk lids Luxury Liner and luxury Liner Pro are too heavy to use upside down so we use Heat Wave Pro or MegaZorbe on ceilings, trunks. And we use Heat Wave Pro or MegaBlock for hoods and engine side firewalls. These more lightweight and fire resistant options are better for engine bays and upside down surfaces. 

Here are a few pics of finished barrier layers, using Luxury Liner or Luxury Liner Pro:

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Complete 2 Layer Install of a Chevy Cavalier Trunk:

First Layer - Constraint Layer - Damplifier Pro 

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 Start of the 2nd Layer - Barrier Layer - CCF/MLV Luxury Liner Pro

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Complete 2 Layer Install of a Chevrolet Suburban Roof (MegaZorbe is used on roofs for the 2nd layer):

First Layer - Constraint Layer - Damplifier Pro


Start of the 2nd Layer - Absorbing Layer - Hydrophobic Melamine Foam (lightweight for ceilings)


These 2 steps are the base foundation for the sound deadening and thermal control. Both noise, and heat will be reduced by a very large margin!

If you want to take your install a step further, you can do this:


Spectrum & Spectrum Sludge automotive vibration coatings

Another way to kill automotive vibrations and structure borne noise is with our acoustical undercoating. We designed our Spectrum noise damper coatings for exterior floor pan applications, but when used inside the car, these vibration coatings provide a seamless barrier that is nearly 300% more effective than tar boards and asphalt sound deadener mats at reducing unwanted road noise, engine noise and exhaust noise.

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Spectrum and Spectrum Sludge can also be used inside of the vehicle instead of Damplifier/Damplifier Pro. 

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Spectrum has many uses, it can even be used on sub boxes: