5 Best Sound Deadening Material for Boat Engine

People who have good knowledge of boat journeys mostly have good experience of the terrifying sound of a boat engine. If you’re tired of your boat’s excessive noise, applying soundproofing material in the engine room is the solution. The most common source of noise is a boat’s engines. Unfortunately, there is no shortage of noise while boating.

But still, a boat rider can ask about the best sound-deadening material for a boat engine. 

Sound Deadening Material for Boat Engine: list of a few best 

Here is the list of the best sound-deadening materials for boat engines. 

Sound Deadening Spray and Paint

Sound Deadening Spray and Paint

The second Skin developed is usually tested by the Spectrum liquid sound-dampening substance, a high-heat and water-based viscoelastic polymer that sticks to metal and stops it from vibrating. Moreover, it also removes tremors and noise.

However, it is used in many vehicles to absorb vibrations and prevent temperature absorption on metal surfaces, such as cars, boats, and trucks. Metal warehouse carts, sub-woofer boxes, and HVAC ducts are also good choices for Spectrum. This operates by putting an end to vibrations. However, it will not obstruct or absorb sound waves in the air.

But, sound-deadening mats have a few problems getting into hard-to-reach areas like the motor’s underbelly and wheel wells, so use Spectrum instead. It can withstand temperatures up to 400 degrees Fahrenheit, so it can even be used as a firewall.

This paint works with a paintbrush or roller in the case of application. Two coats of Spectrum Liquid Deadener are recommended, totaling 2-3 mm thick. It can be 5 mm thick at max.

Second Skin guarantees its products to be of the highest quality. We are sure that our products will perform exactly as stated when installed appropriately. Second Skin’s obligation is restricted to the replacement of defective material.

The weight of this USA-produced product is 14.07 pounds. 


  • reduces vibration and aids in sound deadening
  • It is simple to use.
  • the most effective product for decreasing rattling


  • After using the second layer, it doesn’t appear to be working.

Melamine Foam Sheet

Melamine Foam Sheet for boat

The Mega Zorbe hydrophobic melamine foam is a premier Class A fire-rated and water-repellent sound absorber. It is ideal for absorbing reverberant noise and improving acoustics. Automobiles, trucks, and vans are used for sound and temperature insulation.

Place Mega Zorbe in the door cavity and above the headliner on the roof. The Damplifier Pro sound-deadening mat is a good option for boat engines. Should not be squeezed or placed on the ground.

Each open-cell foam sheet is 12″ thick and measures 24″ × 24″ (4 sq ft). Mega Zorbe complies with fire, smoke, and toxicity regulations in aerospace, transportation, and construction. The best acoustic foam for absorbing mid-to-high frequencies is acoustic foam. Foam does not block noise. However, it does diminish echo and reverberation.

It is lightweight, flexible automobile insulation (R-value per inch: 4.16) that can withstand temperatures up to 350 degrees Fahrenheit. In addition, sound and heat insulation can be improved by stacking sheets.

The Zorba hydrophobic melamine foam sheets are 1/2-inch thick open-cell foam with fantastic features. The entire thickness of the material is waterproofed. Moreover, the foam will be water-resistant for the rest of its life. In addition, an aerospace-grade substance, Mega Zorbe, will provide your vehicle with superior heat and sound insulation.

The high-quality melamine foam is manufactured in Germany and processed in the United States. 


  • If you utilize it right, it’s a high-quality product.
  • If you live in a location where it gets very hot or freezing, it’s well worth it.


  • Slightly expensive 

Audio Noise Control Acoustic Reduce Materials

Audio Noise Control Acoustic Reduce Materials

Audio noise Rubber foam has the same features and noise-insulating properties as the liner. It does not absorb water and does not have the same properties as polyurethane foam. It is light in weight and resistant to oil and gasoline.

The material is a fantastic insulator for boat engine soundproofing. You can deal with both cold and heat thanks to the sound-deadening substance. 

This is especially true in hotter climates. In addition, a well-insulated cabin ensures maximum comfort when driving. 

While your automobile has a powerful engine and an upgraded exhaust system, the liner heat shield material will alleviate the problem of excessive heating. The liner can also be used to insulate the hood.

This excellent water and moisture-resistant self-adhesive backing are too flexible. However, it is easy to install, handle, and cut.


  • Works good 
  • Quite thick foam
  • It’s versatile and straightforward to use.


  • Not much smooth 
  • Packaging is not good

Sound Absorbing Foam + Heat Shield

Sound Absorbing Foam Heat Shield

Second-skin mega-block melamine sound-absorbing foam and pressure-sensitive adhesive backing are covered with 98 percent luminous aluminum foil-faced fiberglass cloth.

This open-cell foam has added water, solvents, microorganisms, and heat resistance. As a result, it complies with smoke, fire, and toxicity regulations while repelling water and withstanding temperatures of up to 1000 degrees Fahrenheit.

The most excellent option for absorbing mid and high-frequency sounds in your vehicle is open-cell foam. Every 2ft x 2ft (4 sq ft) melamine foam sheet weighs around 1/8 of a pound.

Mega Block is an aerospace-grade heat shield insulator. It absorbs engine noise and works as a radiant heat barrier, with an R-value of 4.16 per inch.

To provide an effective and creative automobile solution, high-quality melamine foam is manufactured in Germany before being treated and covered in the United States. The foam from Mega’Block is resistant to most organic solvents and meets or surpasses national and international fire safety standards.


  • Strong adherence capacity 
  • Well sticky facilities 


  • A little pricey 

HushMat HSM30300 1″” x 20′ Quiet Tape Shop Roll, Regular

HushMat HSM30300

Thousands of uses in the automobile, garage, office, boat, and house require one-sided self-adhesive foam tape. to eliminate vibration, rattles, and unnecessary maintenance. 

HushMat quiet tape is used to fasten wires, harnesses, and cables. To use, simply cut with scissors, peel, and stick. The remarkable adhesive technology of HushMat makes this product a must-have in any toolbox. 

Even better, the tape may be unwound and reused without losing its adhesion. Duct tape or electrical tape will not suffice. You end up wasting three times the amount of tape you started with. The weight of this material is 3.2 ounces. 


  • Great sound absorbance tape
  • Good for versatile use 
  • Easy to install


  • Very sticky 

Buying Guide About Boat Sound Absorbing Material

Protect the Outboard Engine

Although it is technically easier to insulate the outboard motor, the consequences will be less noticeable simply because the noise is closer to your ears because it is on the surface.

The cowling, usually composed of fiberglass, protects the outboard engine. This is a thin cover that does help to keep impact noise at bay. However, it would be much better to make it thicker by utilizing dense material.

FatMat for this project is very effective. Vibration noise is inexpensive and is simple to cut to size. In addition, you have the option of covering the interior or exterior of the heat shield.

The thickness of the foam 

Check a foam before buying; it has a good R-value or not. 


Which Mil Is Better for Sound Absorption?

The thicker the material, the more effective it reduces unwanted noise. However, when it comes to actual sound deadening, 50 mil is the industry norm, 80 mil is the middle ground, and anything beyond 100 mils is the gold standard.

Is Fiberglass a Soundproof Material?

When it comes to soundproofing, fiberglass has to be one of the best options. In enclosed facilities such as music production studios, it is helpful to have soundproof walls, ceilings, and floors. Acoustic fiberglass is acoustic insulation of very minute crushed glass or plastic particles.

What Is the Best Sound-Deadening Material for A Boat Engine?

Vibra Block is a sound-deadening substance that may be installed on steel panels. It was created to decrease structural vibrations, making it ideal for boats with noisy engines. In addition, Vibra Block is simple to set up and does not require sealants.

Bottom Line 

To conclude, Spray, foam sheet, paint, and tap are the few products that can suppress the noise of the boat’s engine. So, if you are searching for the best sound-deadening material for a boat engine, use these products. 

Adam Houdge
Adam Houdge

I am Adam Houdge, My journey to helping other peoples to have peaceful lives began. With our experience in soundproofing, we recommended tips & techniques that are affordable and easy to install. Read through our tips and techniques, apply them & Say Goodbye to Noises.

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