Hi there. I had really good luck with this:
My EPOs were in bad shape a few years ago. Many fishing line strikes, bottom chips from hard grounds, and general wear and tear. Like yours I had some sun damage and the fibers were starting to show. Also, I had a bunch of slop in the rigging where the pins went through.
I decided to fill and refurbish the rudders, and then redrill them after everything was completed. First I got regular ole (cheap) JB Weld adn filled all the strikes, dents, dings, and most importantly, the bolt holes. Actually, I drilled out the bolt whole locations to 1/2" and then filled them with JB Weld. That way I had a solid plug to redrill through. The new holes have not wallowed out at all now.
Once the blades were filled, sanded, and smooth -- I was happy with the repairs of the dings, etc -- I mixed up West 2 part epoxy with graphite powder mixed in to make them black. Then I rolled on several coats, wet sanding between each coat, and the end result was STUNNING. They look better now than they did when new.
You can see your face in them. Now, about once every 2 years, I sand them with coarse sand paper, and then add another top coat of West epoxy and graphite. Never a problem, rock solid and looks amazing.
BTW, same proceedure can repair the comptip if the fibers are showing there as well. Mine was quite worn as it spent most of its time with the mast up and on teh beach. So I pulled the Comptip, sanded it thinner, and then epoxy and one layer of carbon fiber omnidirectional tape, and then 2 coats of west epoxy graphite powder again. LOOKS better than new, and I like how you can see the Carbon Fiber mesh in the surface now. Excellent bend properties and rock solid attachment to the mast.
Good luck! Let me know if I can help with any of these lil project. I did both blades and comptip in one weekend.
Enjoy!
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