ResoNix Lockout - Hydrophobic Melamine Automotive & Marine Sound Absorbing Sheet

       ResoNix Lockout is a lightweight, high-performance acoustic and thermal treatment pad designed to absorb sound and insulate against heat in a single, easy-to-install sheet. It consists of a 1 inch layer of hydrophobic melamine foam, faced with a reinforced micro-perforated vinyl acoustic layer, and backed with a 4 mil thick peel-and-stick acrylic adhesive.

       Lockout shares much of its construction with our ResoNix Guardian product, but eliminates the Mass Loaded Vinyl and second foam layer to offer a more cost-effective solution where noise blocking is not required. It is ideal for applications where reducing airborne reflections and controlling heat transfer is the primary goal. The hydrophobic melamine foam provides broadband sound absorption, while the reinforced vinyl facing improves low-frequency performance and protects the foam during installation and long-term use. Lockout’s adhesive backing makes installation quick and clean, with no need for mechanical fasteners or messy spray adhesives.

       One of the most common uses for Lockout is inside vehicle doors, particularly behind midbass drivers, where it helps absorb the speaker’s rear wave and reduce unwanted reflections within the door cavity. This helps improve midbass clarity and reduce resonance-related distortion. It is also highly effective on vehicle roof panels, van walls, and headliners, where it provides sound absorption and thermal insulation in a thin, flexible, and easy-to-install format.

       Lockout is also a great choice for van conversions, RVs, and camper builds, where comfort, simplicity, and clean installation matter. Its lightweight construction and resistance to water, humidity, and heat make it perfect for use in roof panels, wall cavities, and doors without the need for complex mounting methods.

       In industrial and marine applications, Lockout performs well in areas where airborne sound needs to be absorbed, heat needs to be managed, and weight or thickness is a concern. It is particularly useful in enclosures, access panels, and ceiling cavities where reflected energy and thermal control are priorities. Its peel-and-stick adhesive and reinforced surface make it durable and reliable even in environments with vibration or exposure to moisture.

• 24″ x 24″ (2 square feet per sheet)
• 1″ total thickness
• 2 sheets per box (8 square feet total)
• Hydrophobic melamine foam core
• Reinforced vinyl acoustic-facing
• Acrylic-based peel-and-stick adhesive backing
• Adhesive rated from -40°F to 392°F
• Approx. 0.45 lb per sheet (0.9 lb per box)
• Melamine manufactured in Germany
• All other components made and assembled in the USA
• Meets UL94 V-0, UL94 HF-1, ASTM E84, FMVSS 302 fire safety standards
• Full acoustic specifications posted below

       The most popular use case for ResoNix Lockout with our customer base is inside car doors, specifically behind door-mounted midbass drivers to improve sound system performance and reduce external noise intrusion. In most cases, we recommend using at least 2 pieces per pair of doors for optimal coverage. This allows for proper treatment of the outer door skin behind each midbass driver, while maintaining enough surface area to absorb and block unwanted noise effectively.

       Like all absorbers, Guardian follows the principle of surface area. The more of it you apply in the correct locations, the better your results will be. What makes Guardian different is its ability to absorb, block, and insulate all at once. However, it is still subject to the same basic rules: full coverage will provide full results, while partial coverage will provide partial results. Guardian does not magically solve acoustic problems with small patches. It performs best when applied deliberately and extensively in areas where noise or unwanted energy exists.

       We get emails regarding "how much should I use" often. The problem is, every application and situation is different. Every panel is different, every car is different, and everyone’s end goals are different. With our ResoNix Sound Deadening Reference Information & Guide section, as well as our ResoNix Sound Deadening Buyers Guide, we try to give you as much information as possible in order to help you make the most informed decision possible.