In my view, the sealant will have to be flexible and thus I wouldn't use an epoxy. Every time the sails load up the rig, the chain plates flex and if the sealant doesn't flex along with it, it'll simply start to leak again.
I used Sikaflex on my starboard chain plates and left them for a few months before doing the port ones. They appear to be sealed well and no more leaks.
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