I am currently sanding (and sanding and sanding) the Fiberglas applied to the front of the canopy. At this point, it has become an exercise in exposing the electrical tape applied fore and aft, which in my case is black. Unfortunately, the dyed epoxy resin applied as the first layer is also black.
I wish I had used a different color tape to make it easier to find the edge of the tape. I suggest you use yellow, red, or some other color than black.