: It is typical to have wrinkles at the bow and stern on the keel. PVC doesn't
: stretch, so I slice it along the keel in those places and overlap. With
: wrinkles I slice them and overlap them if possible, or cut out a dart.
: This all gets covered with another strip of material. On those wrinkles I
: also slice them and either dart them or overlap them. Those cuts can be
: offset from the layer below so that you get your waterproof seal. The
: added layers give you more abrasion resistance as well.

: PaulMon

Thanks Paul, Sean & Tom,
I ended up cutting a 12" slit along the keel at the stern. This allowed the fabric to spread about 1" apart and thus follow the contour of the kayak smoothly. A patch over top of the keel re-joins everything. It seems to have worked out all right. Only the stern needed the extra attention, things worked out OK at the bow. I guess it's just the shape of this particular kayak and the way it all comes together at the stern.
Now that I have the hull skinning completed, I worked today on building some air bags for the bow and stern. They will be removable (theoretically), but it's a lot easier to get them in there and check their fit without the deck in place.
Cheers,
Bryan