-- Last Updated: Oct-30-12 10:22 PM EST --
I had a Bending Branches Expedition Plus paddle. It has a black strip around the edges. BB calls it Rockguard, but I don't know what it is. I believe (memory fades) I met a paddler who had put a thin strip of graphite around the edge of his paddles. I'm wondering if that is what BB uses on their paddles. Sorry, not very useful--just scratching my head for ideas.
I have a spruce paddle on which I tried to emulate the Rockguard edge, even though I don't know what Rockguard is. I fiberglassed the blade. rather than fold the edges over, I let it over run the edge of the blade. When the epoxy dried, I cut off the excess, leaving about .25" of excess material. Then I built up epoxy on/around the extended edge until I had a solid epoxy edge about .25" thick. The edges on that paddle have held up very well. The paddle gained a lot of weight, but was feather light to start with, and is still a nice light paddle.
Another idea that occurs is the Keeleazy strips kayakers use on their boat bottoms. You would probably have to varnish or epoxy the area where you wanted to stick the keeleazy, and maybe use heat on it to get it to fold over the paddle edge. Just an idea.
Hope this helps.