While fixing the central locking (thanks everyone!) I also used sail
tape to get the panel edges looking good again.

It basically double sided tape about 6mm wide... you can follow tight
curves and it sticks on foam and fabric. It's great for making stuff
out of polytarp too.

http://www.duckworksbbs.com/sailmaking/tape/index.htm

CH-ASV3 - 0.5 mil polyester film coated on both sides with 3 mils of
an ultra high peel acrylic adhesive. Designed to immediately adhere
to most types of sail materila and Sunbrella without head assist.
Used by many sailmakers to seam spinnakers without sewing. 3/8" wide
- 60 yards per roll.

http://www.google.com/custom?sitesearch=gerry.vanagon.com