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Spectrum Sludge - 5 Gallons *MADE IN USA*

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Product Description

Spectrum Sludge - 5 Gallon


Spectrum Sludge™ is the thickest noise and vibration paste of its kind specifically formulated by Second Skin with Mica, Talc, Calcium Carbonate, and crushed rubber. Sludge comes with a base gallon of Spectrum and  a separate container of  a thickening  additive. By increasing the amount of the additive mixed into Spectrum, the viscosity will change from a chocolate syrup thickness to a peanut butter thickness. Sludge may then be installed with a gloved hand or trowel. 

Spectrum Sludge™ is a high temp water based viscoelastic polymer damper designed to be installed on the interior or exterior of prepared sheet metal, fiberglass, carbon fiber or aluminum. Stopping the vibrations is like holding a noisy wind chime or bell with your hand. Once the vibrations stop the noise stops. Spectrum Sludge kills vibrations in a similar way - It stops the structure from vibrating, thus, reducing noise.

Each gallon of Spectrum will cover 10 sq ft at the recommended 3 coats for a total thickness of 3mm. Each coat should be applied at 1mm thickness 30-60 minutes apart. Once the final coat has been installed, allow 24 hours before the next layer of product or upholstery is installed. Spectrum may be painted or covered with a bed liner after 30 days.  

The next step is to reduce air borne noise by installing a noise barrier MLV (Mass Loaded Vinyl) Luxury Liner Pro on top of Spectrum

A water based primer must be installed to plastic, aluminum or fiberglass prior to installing Spectrum.

Application surface should be dry and free from rust, oil, dirt and debris. Denatured alcohol works well to pre-clean leaving no film. For high rust climates and previously rusted metal install POR 15 first. 

*Spectrum Sludge cleans up with water*

 * 400 degrees heat rated*

*Do not freeze* If product freezes do not mix, shake, or move until completely thawed. 

*Do not apply product in temperatures below 50 degrees Fahrenheit.

*Spectrum and Spectrum Sludge are not bed-liners and may be damaged by foot traffic*

Spectrum has a shelf-life of six months, provided it's stored at room temperature. 

Noise Reduction Uses

  • Under Carriage
  • Wheel Wells
  • Truck Bed (Before a bed liner)
  • Door Skins - Outer Skin & Inner Door Frame.
  • Floor - From the front firewall to rear deck.
  • Firewall - Cabin side or engine side (450 degree heat rating). 
  • Van/Semi/SUV Panels 
  • Pillars - A, B, and C pillars. 
  • ATV's
  • Trunk
  • Generators (Must be 2" away from  heat sources)
  • Computer towers
  • Metal Screen Doors 
  • Coin Counting Machines 
  • Warehouse/Hospital Carts or Tables 
  • H VAC Ducts
  • Elevator Shafts 


Weight per wet gallon = 12.5 lbs.

Weight per cured gallon = 11.0 lbs

Coverage: 1 gallon = 40 sq ft @ 1mm thickness

Coverage: 1 gallon = 10 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 Fahrenheit

Solubility in Water                         Soluble  

Percent Volatile                             25

Layer Thickness                             1 mm or 0.040"

Thermal Insulation

Spectrum Sludge contains 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 gloved hand. 

How long does Spectrum take to cure?

A 30 full days to fully 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?

24 hours is recommended. 

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 mats and coatings. For example: Install Damplifier Pro on interior sheet metal then use Spectrum for the hard to reach locations. Or, install Spectrum to the underside of the cars floor pan and wheel wells. This will sandwich the sheet metal between Damplifier Pro & Spectrum.

Suggested Thickness:

 Minimum = 40 mils (1mm)

Recommended thickness = 118 mils (3mm)
Maximum = 196 mils (5mm)




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