Design Engineering Boom Mat Spray-On Sound Deadener 18 oz 4-Pack — Sprayable Noise & Heat Damping for Tight Cavities

Design Engineering Boom Mat Spray-On is a spray-applied sound deadening and thermal barrier that reduces road noise, vibrations and rattles in hard-to-reach vehicle areas.

Designed for tight cavities, irregular panels and locations where sheet products can’t reach, this aerosol formula adheres to metal and many uncoated surfaces to quiet vehicles and insulate against heat. Each 18-ounce can delivers a durable coating that resists cracking, can be layered for increased performance and becomes paintable within hours. VOC-compliant nationwide, it’s suitable for automotive, marine and other vehicle applications where reducing noise and thermal transfer matters.

How does Boom Mat Spray-On reduce road noise and vibrations?

The product forms a flexible, damping layer that absorbs vibrational energy and interrupts noise transmission through body panels. Multiple coats increase mass and damping for thicker, quieter coverage.

• Sprays into crevices and contoured areas where sheet mat cannot conform
• Flexible finish prevents brittle failure that can transfer noise
• Apply in layers to increase coverage and damping performance
• Rated to tolerate elevated under-hood and underbody temperatures

Where should I apply it on my vehicle for best results?

Target zones include trunk cavities, inner fender wells, door interiors, rear quarters and body panels — places that radiate road and engine noise or vibrate frequently. Use it wherever access is limited or where a sprayed contour-fitting coat is preferred.

• Trunk and wheel wells to dampen road and tire sounds
• Door and quarter interiors to stop panel buzz and rattle
• Undercarriage and engine bay areas for heat and noise management
• Patchy or irregular surfaces where roll-on mats won’t sit properly

How long before I can paint over it and how durable is the finish?

The coating dries sufficiently to accept paint in about six hours under typical conditions, allowing fast turnaround for cosmetic or protective topcoats. Once cured it stays flexible, resists chipping and helps protect metal against corrosive elements.

• Paintable after approximately 6 hours of dry time
• Remains flexible to avoid cracking or flaking with panel movement
• Helps shield substrate from moisture, reducing rust risk
• Rated to withstand temperatures up to 300°F (approx.)

How much area will a pack cover and how should I store it?

One can covers roughly part of the job; a full 4-pack is useful for several areas or a more comprehensive install. Store cans in a cool, dry place and note the two-year shelf life from the manufacturer date stamped on the can bottom.

• Approximate coverage: about 20 square feet per stated quantity as guidance
• Best to apply multiple thin coats rather than a single heavy pass
• VOC-compliant formulation for sale throughout the United States
• Two-year shelf life; check manufacturer date on the can base

Who is this for: Enthusiasts, installers and DIYers who want a sprayable solution to quiet and insulate vehicles in areas that are not practical for sheet mats. It’s a practical choice for car restorations, performance builds, sound-system installs or anyone seeking to reduce rattles, road noise and heat transfer without extensive disassembly.