Boom Mat Liquid Brush-On damping is designed to reduce the vibration from structure borne noise in those hard to reach areas such as trunk interiors, fender wells, undercarriage, body panels, rear quarters and inside door panels. Where to use: Floors, door skins, trunks, roofs, any vertical or horizontal interior surface and any hard to reach areas. All the benefits of Boom Mat Damping Material in one easy to apply liquid!