Site Information

 Loading... Please wait...
  • Compare
  • Gift Certificates
  • My Account
  • All prices are in USD

Spectrum - 5 Gallons

This product ships in 1 business day
Calculated at checkout

Product Description

Spectrum™ is a water based acrylic polymer under coating designed to reduce sheet metal resonance and structure borne noise. It is a true viscoelastic sound deadener that can make any vehicle quiet as a luxury car.

Now made with Cryogenically manipulated polymers and high temperature wax, Spectrum is the only product on the market of its kind! Water based so there is no chemical out gassing or harmful vapors, no mask or ventilation system needed to apply. 

Spectrum can be applied as an interior coating on the sheet metal behind the upholstery, on doors, trunks, firewall, engine bay firewall, ceiling, and hood. It can also be used as an acoustical undercoating on the outside of the floor pan to create tomb like silence and provide mechanical protection from rust.

When applied to the interior and exterior floor pan, Spectrum can reduce 300% more road, engine and exhaust noise than traditional OEM dampers and tar boards, all at half the weight. Once cured it will form a water resistant bond and protect the covered metal from rust forming. Spectrum can withstand 400 degrees F of temperature without issue, so it is safe to use on the hood and engine bay firewall, as long as it is kept 2" from any heat source. 

Each gallon of Spectrum will cover 10 sqft at the recommended 3 coats totaling a 3mm thickness. Each coat should be applied at 1mm thickness. 30-60 minutes of cure time between coats. After the fianl coat has been applied, the next product or upholstry can be applied after 24 hours of cure time. If you want to paint Spectrum or cover it with a bed liner we recommend you wait at least 7 days for the Spectrum to be totally cured. 

*Spectrum is water based and will not adhere permanently to plastic or fiberglass without first using a water based primer.

** Application surface should be dry and free from rust, oil, dirt and debris prior application. We suggest using denatured alcohol to clean the surfaces because it does not leave behind a film like degreasers do. For high rust climates and previously rusted metal we recommend using a primer like POR 15 first. **

*Do not freeze and thaw. If product freezes do not mix, shake, or move the gallon until completely thawed. Do not apply product in temperatures below 50 degrees Fahrenheit.

Spectrum and Spectrum Sludge are not bedliners they do not get egg shell hard like bedliners, they will hold up to daily driving rocks/mud in wheel wells and under carriages just fine. If you wish to use Spectrum or Spectrum Sludge in your truck/jeep bed or floor area you will need to cover it with a bedliner or other material to protect the Spectrum from heavy weight item hits, rocks in shoes, and other rough treatment that bedliners protect from. 

Spectrum Spray Gun Suggested Requirements:

5 - 6.5 CFM @ 50 - 80 PSI (It will Spray without those settings, it will just take longer as you will need to allow the tank to fill up before re-starting the spray)

Typical Places of Use:

  • Under Carriage
  • Wheel Wells
  • Truck Bed
  • Door Skins - Outer Skin & Inner Door Frame.
  • Floor - From the front firewall all the way back to rear deck seat wall.
  • Firewall - Cabin side firewall or engine side firewall (450 degree heat rating). 
  • Van/Semi/SUV Panels - All over those large, flimsy, resonating sheets of metal.
  • Pillars - A, B, and C pillar areas. 
  • ATV Under Bodies & Plastics
  • Trunk - Floor of trunk, walls of trunk, and trunk lid. Don't forget to get that spare tire area covered too.
  • Generator Boxes - RV, Van, or any place a generator is used, place the product around the generator enclosure to kill the vibration noise (Must be 2" away from generator heat sources)
  • Computer tower walls - Kills the vibration noise resonating through the metal wall.
  • Screen Doors - Apply the product in strategic places throughout the door to stop the load banging when closed.
  • Money Counting Machines - Used inside of shell to quiet down the noisy coin dropping.
  • Warehouse Carts - Apply to the bottom of the cart to reduce tinny, clunky noises. 
  • HVAC Ducts/Units - Applied tot he metal ducts or unit housings to cut down on the vibration noise.
  • Elevator Shafts 


Weight per wet gallon = 12.5 lbs.
Weight per cured gallon = 10.2 lbs

Coverage: 5 gallons = 200 sq ft @ 1mm thickness

Coverage: 5 gallons = 50 sqft @ 3 mm thickness (2-3 Coats) Recommended

Appearance & Physical State        Pigmented liquid/paste

Color                                             Wet Blue/Black once cured

Odor                                              Very Mild Solvent/None when cured

Viscosity                                        4000 centipoise

Specific Gravity (water = 1)         1.45

Vapor Density (air = 1)                 >1

Boiling Point                                  >400 Degrees Farenheit

Solubility in Water                         Soluble  

Percent Volatile                             25

Layer Thickness                             1 mm or 0.040"



Noise Reduction Uses...

Whether you are looking to quiet down your hot rod, or make your daily driver comfortable as a luxury car, Spectrum has proven to be the most popular & most efficient coating on the market.

Here is a quick lesson: 

Much of the reducible noise in any car is structure borne, meaning it comes from vibrations, like a wind chime. Unlike wind chimes however, our cars are not tuned to any specific musical frequency, so what we end up hearing is the road noise, engine rumble and exhaust drone.

Stopping the vibrations on your cars metal panels is much like stopping a noisy wind chime with your hand. Once the vibrations stop, the noise stops.
Spectrum Kills vibrations in a very similar way. It stops the cars sheet metal from vibrating, thus, killing structure borne noise.

Once Spectrum has cured, the next appropriate step is to apply a noise barrier on top of the vibration damper. Noise barriers like our mass loaded vinyl barrier Luxury Liner Pro

Mobile Audio

If you have an aftermarket, sound system, then you know that a lot of the musical energy is spent, and even wasted by vibrating and flexing the your cars metal panels. Not only are these vibrations loud, and obnoxious, but they also limit the potential of your stereo systems output

Spectrum will help improve your audio system in several ways.

Since it is a vibration damper it will obviously reduce the panel vibration caused from your speakers allowing your music to sound clearer. It also strengthens the cars panels helping to "trap" the bass in your car.

With stronger, non flexing panels, the energy is no longer being wasted and stays inside the car, making your music louder, clearer and less obnoxious to those around you.

Another way Spectrum improves your audio system is by reducing ambient sound like road noise, engine noise & exhaust drone. When you can quiet down the rest of the car, the stereo has less sonic real estate to fight for, and the perceived volume increases.

Even if you are using one of our vibration mats, Damplifier or Damplifier Pro, you can still stand to gain from a gallon or 2 of Spectrum. Adding as little as 1 gallon to to the areas of the car you are unable to reach with your damping mats, can help in increase surface coverage by as much as 15%.

Thermal Insulation

 Spectrum will help reduce heat. Spectrum is made with Mica, Talc, Calcium Carbonate, and crushed rubber. All of these ingredients help stop thermal transfer.


What is the difference between Spectrum & Sludge?
Spectrum and Sludge are nearly identical products. The only difference is the viscosity. Spectrum has the consistency of heavy chocolate syrup and is easy to spray, brush or roll on. 
Sludge has the consistency of peanut butter and is too thick to spray, but can easily be applied with a putty knife, trowel or paint brush. Due to the ultra viscous nature of Sludge, only one thick coat is needed, making it better for quick and easy installs.
Once cured the products will perform exactly the same, weigh the same and will look nearly identical.

How long does Spectrum take to cure?
like allL water based products Spectrum will take 30 full days to cure but will be dry to the touch in 30-60 minutes depending on the ambient temperature and humidity.

When can I put my upholstery back in place?
We suggest that you allow a minimum of 2 days for Spectrum to dry before reinstalling your upholstery. 

What is better, Spectrum or Damplifier?

Both products are designed to do the same basic function. Reduce noise through the reduction of vibrations. Both have their place, and both excel at specific frequency ranges. This is why we suggest using a combination of damping mat and coatings.

We suggest using Damplifier Pro as your base foundation inside the car, on all the panels hidden by upholstery, then use Spectrum in the hard to reach spots. (A single gallon can increase surface coverage by as much as 15% in a moderate size car which can mean a large reduction in unwanted noise.

Then use the Spectrum independently as and undercoating on the underside of the cars floor pan. This will sandwich the sheet metal floor between Damplifier Pro & Spectrum, allowing for the ultimate approach in vibration deadening.

Spectrum has a shelf-life of six months, provided it's stored at room temperature unopened. Once opened it will stay good for 30 days only if re-sealed air tight.

Suggested Thickness:

Minimum = 40 mils (1mm)
Reccomended thickness = 80 mils (2mm)
Maximum = 120 mils (3mm)

*Spectrum is water based and will not adhere permanently to plastic or fiberglass without first using a water based primer.

*Application surface should be dry and free from rust, oil, dirt and debris prior application. We suggest using denatured alcohol to clean the surfaces because it does not leave behind a film like degreasers do.

*Do not freeze and thaw more than twice. Do not mix until completely thawed. Do not apply product in temperatures below 50 degrees Fahrenheit.

Product Videos

Second Skin Spectrum Acoustical Undercoating & Damper 01:52

Buzz Thompson spraying in our Second Skin Spectrum.

  • Second Skin ...
    Buzz Thompson spraying in our Second Skin Spectrum.
  • Second Skin Sp...
    In this video we show everyone how easy Spectrum liquid sound ...
  • Second Skin Je...
    This is episode 110 of roddin' & Racin' where we use Second Sk...
  • Second Skin Sp...
    Installation of Second Skin Audio's Spectrum liquid sound dead...
  • Second Skin on...
    Short and informative! Demonstrates both the effectiveness and...
  • "24 Layer" Por...
    Tons More Pics here:

Product Reviews

Write Review

  1. Its almost cheating 5 Star Review

    Posted by on 1st Sep 2017

    I'm using Spectrum as a sound deadener and under coat for my Ultima Evolution and it works great! It's very easy to apply, and cleans up unbelievably well. I've used it on steel, Aluminum and fiberglass, putting an etching primer down then the Spectrum. It's also California friendly for all you west coast builders out there.

  2. Excellent Sound Management 5 Star Review

    Posted by on 29th Oct 2016

    Spectrum takes the tingy sound from metal or fiberglass and makes it sound like it is 3 feet thick.
    All vibrations are absorbed and also creates a protective barrier from road debris.

  3. great product 5 Star Review

    Posted by on 2nd Jun 2016

    it went on perfect no problem using the whole 5 gallons and even whe i used it wisely i covered spots of the car were i cant go in and i even went under the car maked the car music sound 10X times better and much better when using damper pro

  4. Awsome 5 Star Review

    Posted by on 27th Jul 2014

    Have only done the doors on my suburban so far but what a difference. Radio sounds better and the ride is much quieter. I can't wait to do the floor pan and wheel wells. Am going to do the wife's Camry next.

  5. Thanks again for all your help 5 Star Review

    Posted by on 6th Nov 2012

    Hi Anthony, We ordered 6 gallons of Spectrum & 4 sheets of the Overkill from you last week. I just wanted to let you know how much we appreciate your customer service. You should be very proud, my father mentioned to me that he was extremely impressed with you & your company. I know that’s not saying much since you have never meet him before. But being his son I know how important customer relations is to him. He's spent almost his entire life in a "Sales Related Field" real estate to be exact so he can appreciate someone who takes their time to be as courteous & helpful as you. Thanks again for all your help & expertise, the product arrived on Monday and I am going to be applying it tomorrow afternoon.

  6. dubbed the name "GO TO GUY" 5 Star Review

    Posted by on 6th Nov 2012

    I was referred to Anthony by Steve at Digital Designs in order to fully deaden my 05 Chevy Avalanche being used as a demo vehicle. Anthony was dubbed the name "GO TO GUY" to kill unwanted vibrations. I called Ant and told him my audio specs and he gave me a sponsorship along with the deal of the century. I received 3 Shop Packs of Black foil Damplifier Pro, 3 Gallons of Spectrum, Spectrum spray gun, Fury knife, and wooden roller. All I can say Ant is WOW this stuff does everything described and more. I put 2 layers of Damp Pro on the entire inside of truck and 4 coatings of spectrum on the inside as well as under the truck. 99 is because i took the midgate out and i hear bed noise. Thanks again Ant and i`ll be contacting you shortly about getting 10 sheets of Luxury Liner Pro.

Find Similar Products by Category