20.Before I could stick the Scosche stuff down I needed to get most of the old glue off the floor pan. A drill motor fitted with a wire brush did the trick. A scraper would have worked as well, but again it would take longer. The sound-damping material is a peel-and-stick install, so it went in pretty easily. This stuff doesn't really stretch so don't try and push it down into deep areas. Just cut smaller pieces to get into those spots.