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Then, using 60 to 80 grit sandpaper, sand through the outer layer of fiberglass, and the exterior layer of carbon fiber. Sanding should be at a
45-degree angle to the outside surface of the damaged area, so as to allow even load distribution of the repaired area with the surrounding structure.
Below the sanded area you'll find the Kevlar/Aramide honeycomb. If the honeycomb is crushed, then it will need to be removed. This can be done
with a knife, making sure that the outside edge is cut away at a 45-degree angle to the outside surface.
Once you have removed the honeycomb, inspect the interior layer of carbon fiber for any damage, to determine whether it will need patching. If the
honeycomb isn't damaged, you can check the interior carbon fiber surface, by poking through the honeycomb with a pair of tweezers. If the interior
layer has been punctured, or deformed, draw another line with the felt tip pen 1/2 inch outside the previously sanded area (this previously sanded
area encloses the extent of the damage plus a 1/2 inch on each side) on the outer surface of the cell tube.
