Have used to insulate my car doors the Jehnert insulating nonwoven. Vibrations of the door panels, which were previously available in bass-heavy music have been so effectively suppressed. With a good pair of scissors can cut the insulating nonwoven properly. For larger areas, the gluing is simple and the fabric keeps very well. For very small surfaces and on edges and corners you have to additionally work with double-sided tape, then you can also insulate the last corners so.
