Because we constantly use sound deadening paint here as part of our arsenal in fighting rattles and resonations, we've actually developed our own. Used primarily for deadening subwoofer enclosures and door pods to remove their resonant ring, the liquid damping compound is a lightweight, water based, viscoelastic vibration damping material that can be used just about anywhere, effectively reducing noise and vibrations in car body panels as well. Being closer to a solid than a liquid though; it's measured in weight rather than volume. Each container equates to around a litre. You'll need around two litres to completely cover the inside of a standard one cubic foot sealed enclosure. Feel free to contact us for bulk-buy pricing and more info including all the technical specifications.