The Lord Corporation Fusor 231/234 Sound Dampening Material is designed to reduce noise, vibration and harshness on vehicle metal panels when placed between any outer skin and inner structure where sound dampening is required. Fusor 231/234 is a two-component urethane that offers excellent adhesion to metal, e-coat and existing NVH materials, enabling a flexible seal with no shrinkage or expansion. It can be applied to vertical or overhead surfaces with no sag or drip.