How water-based damping coatings work
A water-based damping coating relies on a viscoelastic polymer layer that turns vibration energy into heat, and it also absorbs and blocks some sound.
Vibration: energy turned into heat
The polymers in the coating are both elastic and viscous. When a panel vibrates, the coating deforms with it and internal friction converts vibration energy into a small amount of heat, so the vibration amplitude falls. The coating is also flexible enough to follow the movement of the structure.
Noise: absorption and blocking
The polymers absorb sound energy and turn it into heat. The coating usually contains fillers such as particles or fibres that scatter and absorb sound; the type and shape of filler can be adjusted to the need. A coating bonded to the surface also helps reduce transmission and reflection of noise through that surface.
Keep the two apart in use
Damping and sound insulation are different things: a damping layer mainly reduces panel vibration and the noise radiated by it. The real result depends on substrate, coating thickness, frequency range and temperature, and must be confirmed on samples.