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Spectrum™ Spray On Deadener

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How Much Spectrum Do I Need?

Vehicle Class

Call us to discuss your project. 1-800-679-8511

Vehicle Coverage

Estimated Square Footage

0Sq Ft
How do I get exact square footage?
  1. Get a tape measurer
  2. Measure the length and width of each surface
  3. Length x Width = Square Footage

Spectrum™ Liquid Sound Deadener

Spectrum™ is a durable and long-lasting vibration damper that's as good on a hot rod as it is on a metal roof. By reducing sheet metal resonance and structure borne noise, any vehicle can be quieter and more comfortable to drive. Originally formulated as undercoating sound deadening, Spectrum™ liquid deadener is an awesome substitute anywhere you'd use a sound deadening mat.




  • Water based viscoelastic polymer for damping loud metal vibrations
  • Lighter than mats at equivalent thickness (recommended: 2-3mm total thickness)
  • Enhanced durability for use in extreme environments or outside the vehicle as an undercoating
  • Waterproof and rustproof
  • Chemical resistant, non-toxic, and odorless once cured
  • Self-extinguishing
  • Temperature rated up to 400°F
  • Apply with a brush, roller, or spray gun (see Spectrum™ Spray Kit for spray applications)
  • Proudly made in the USA



 Size Options   1 gallon, 5 gallon, 55 gallon drum 
 Square Foot Coverage  20 sq ft per gallon at 2mm thickness
 Total Thickness   Recommended 2-3mm, max 5mm
 Layer Thickness 
 Apply in 1mm layers
 Weight   11 lbs (cured), 14 lbs (wet)
 Water Resistance   Waterproof and rustproof
 Temperature Resistance   400°F
 Application Temperature   Above 50°F for first 24 hour dry period 
 Primer Required?  Shiny/waxy surfaces will require a primer 




 Spec Sheet   Spectrum™ Product Sheet 
 Install Guide   Spectrum™ Install Guide (Spray or Brush) 



Material Testing

Acoustic Loss Factor @ 200Hz

 Temperature  23°F   50°F   77°F    104°F    131°F 
 Spectrum (2mm)   0.037   0.083  0.215   0.105   0.034 
 Spectrum (3mm)   0.066  0.119   0.363   0.258   0.068 
 Spectrum (5mm)   0.081   0.165   0.534   0.379   0.093 


 Tested Properties   Performance 
 Color  Blue (wet), Black (cured)
 Viscosity   4000 centipoise 
 Specific Gravity   1.45 
 Max Temperature   400°F 
 Solubility   Soluble
 Odor   None (when cured), Mild (as solvent) 
 Flammability   Self-extinguishing
 Water Resistance   Waterproof
 Shelf Life  1 year (unopened), 30 days (opened) 



Product Usage Tips

  • Clean up with water within 30 minutes of application. Do not wait longer or Spectrum™ will dry. Always clean the spray gun between coats by running water through it.
  • If applying multiple layers of Spectrum™, wait 30-60 minutes for the product to cure and change color from blue to black.
  • The temperature must be above 50°F for the entire 24 hours cure period after applying Spectrum™. Dry times increase with low temperatures and high humidity. If you expect longer than usual dry times, we recommend thinner layers (0.5mm instead of 1mm) to the same total thickness.
  • Spectrum™ is designed to adhere to metal. Do not apply to plastic or fiberglass without the proper primer. If applying to a high gloss wax coat, you must sand down and apply a primer.
  • Do not freeze Spectrum! If it does freeze, do not mix, shake, or move until it has completely thawed.
  • Wait 24-36 hours (depending on humidity) before putting upholstery back in the vehicle. Wait 7 to 10 days before painting or applying a bed liner.
  • As Spectrum™ cures, its deadening properties will continue to increase. Vibration damping doubles from 4 hours --> 48 hours, and continues improving for 7 days.
  • Spectrum™ contains rust inhibitors and dries with a seamless finish. It is water resistant and safe to use for boat soundproofing.
  • Spectrum™ is not a bed liner. Even after it has cured, it can be damaged by heavy impact.
  • Shelf life of 1 year when stored at room temperature
  • Wheel well sound deadening applications require about 2 gallons for all 4 wheel wells (all vehicles) and helps a good bit with soundproofing car road noise.
  • Use Spectrum™ anywhere you have vibrating metal to soundproof the structure, like a car or soundproof shed roof.



Installation Instructions

  1. After upholstery or carpet is out, remove loose debris, rust, dirt, and waxy oils to insure a solid contact surface. Clean with denatured alcohol.
  2. If spraying, mask off all interior and exterior areas of the car for overspray. Cover mechanical parts, wires, and wire harnesses. If you don’t want Spectrum™ on it, mask it off.
  3. Spectrum™ can be applied with a brush or with the Second Skin spray gun.
  4. The recommended total thickness is 2 to 3 mm for a vehicle. Some commercial applications can do 1mm total thickness. Contact us if you have questions!
  5. Apply in layers 1mm layers. If Spectrum runs, you are applying it too thick. Always clean the spray gun between layers by running water through it until there's no dark pigment.
  6. After 30 to 60 minutes (depending on temperature and humidity), Spectrum™ will skin over and change colors from blue to black. Once Spectrum™ is black, it’s safe to add another layer.
  7. Most regular paint guns will not be able to spray Spectrum™ due to the extremely viscous consistency. We suggest using a HVLP undercoating gun or the Second Skin spray gun. The nozzle and stem must be 2mm.
  8. Spectrum™ is easy to clean up with water if done within 30 minutes of applying the product.
  9. Allow 24-36 hours before another product or upholstery is installed. Spectrum™ may be painted or covered with a bed liner after 10 days. 

Download the Spectrum™ Install Guide for comprehensive spray on sound deadener and brush on application instructions



Common Product Uses 

  • Alternative to a peel and stick sound deadening mat. Also can be used in combination with Damplifier Pro for maxed out sound dampening (the mat goes on first, Spectrum™ on second) 
  • Personal vehicles (interior, undercoating, wheel wells)
  • Commercial vehicle fleets
  • Transportation industry (buses, trains)
  • Van conversions
  • Metal roofs
  • Metal carts
  • Elevator shafts