I have had the best luck with a single layer of fiberglass per side. Cut the glass bigger as you will be sanding off the extra. Put a good coat of epoxy on the wood, lay the glass over and then put more epoxy so the cloth is covered.
The stress that produces the crack in the rudder is in the outer part of the rudder skin. I have rebuilt several and have never had one come apart after being fixed.
Take a belt sander and sand the top of the rudder to basically where the rudder cheek ends. Both sides. You need to sand it, so...
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