I used qwikliner spray on bedliner.It is based on the low pressure system."Low Pressure" material is softer and more rubber like with a coarser texture.This makes it more slip resistant. Because it has a 15-20 second gel time it can flow into low places and fill them much better than "High Pressure" can. Due to "Low Pressure's" density and thickness, it is an excellent sound deadener. Body rattle and road noise are greatly reduced.