Here is what the skirt looked like after being popped off the airplane:
I marked a rough trim line, and then used a cutoff wheel to trim the excess glass to within 1/8" of the real shape of the skirt.
Then I block-sanded all the edges until the overhang was completely gone.
I sprayed another coat of grey primer…
…and sanded most of it back off again. Looking pretty good, only a few very minor low spots left.
I mixed up a big batch of Superfil and squeegeed a thin skim coat across the entire exterior surface of the skirt. Most of this will get sanded off, but what remains will fill the fiberglass weave and become the basis for future efforts to get a smooth surface.
