Do not remove any of the red adhesive liner during this testing segment. Place your first piece of SLIPLO up against the surface area you want to protect. Generally, a good rule of thumb is to start from the center of the bumper and test each consecutive piece, moving towards the driver side of the car. Use your pen to mark any overlaps, screws, and holes on the SLIPLO piece which require any type of cutting. Once satisfied, move onto the next piece and repeat.