After sanding thoroughly, wipe down the cap with paint thinner to remove dust and any oils. Now lay the cap down on your roll of carbon fiber and cut out a piece that is at least 30mm larger on all sides than the cap. Using 3M Formula 77 or 90 spray adhesive, lightly coat one side of the graphite piece you just cut. Apply the cut piece to the mirror taking your time to preserve the pattern and prevent creases.