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Re: Mirage 27 (Perry design) - rudder repair
This has been discussed in a number of threads on here. Try searching in the search function here with terms like "Cracked rudder" or "Water infiltration in rudder" and "broken rudder".
People have talked about a process of ensuring that the rudder is completely dried out inside and then refinishing the crack with epoxy or reglassing it. I've not had any personal experience with it, but you already seem to be ahead of the game compared to the guy who recently posted on here that his rudder fell completely off in the bay just outside of the marina. He was going to have to start from scratch to build a new one.