On my last skinning job, I somehow screwed up and cut the fabric too short along the middle of the fore and aft deck. I pulled some huge holes in it, pulling it close enough to stitch up. One hole/pulled area was about the size of a quarter. I used dental floss to "weave" it back together -- think what the web of a drunk spider would look like. The cris-crossing floss provided a little more support for the goo. After that, standard varnish/painting.

BTW, I think my mistake was in not pinning the fabric to the keel when I pulled it across the decks to trim along a batten-guide. I think I must have pulled the fabric across the batten to the point where it slipped around the keel. Odd it only occurred in the middle third of each deck, it was right at the ends, and nearer the cockpit on either side. I'd never pinned the keel before, but I think I always will now.