A single section of PVC will not conform easily to the compound deck shape of a folding Greenland kayak. I've found it easier to use multiple sections, especially on a folding skin.

The "Sea Rover" has a 5 section deck. Sections 1 and 2 are glued to the hull and to each other with 1 inch overlaps of the PVC.

Section 5 is glued to the aft hull. The coaming area receives two sections of PVC. ( Sections 3 and 4).

The cuts in sections 3 and 4 allow the PVC to wrap under the coaming base plate for Velcro connection..