When the lay-up has fully cured, the surface may be shaped and sanded smooth. Use a sanding block with the same 7 inch radius as the final lay-up. Begin with 40 to 50 grit sandpaper to get the general shape. Use caution so as to not sand the electrical tape on the C-100S Windscreen.
When the shape is nearly correct and the thickness of the edge of the lay-up on the windscreen is nearing the thickness of the electrical tape, switch to 80 to 100 grit sandpaper and work very carefully until you are just contacting the tape on the windscreen and the aluminum skin at the edges.
Remove the second layer of electrical tape (leaving just one layer) and sand very carefully using 150 grit sandpaper until just beginning to see sanding marks in the electrical tape.
I also fabricated a 7" radius gude tool to use for this step.