Epoxy-based paints are often used as osmosis barrier coats on sailboats, so an epoxy-based paint should provide relatively good protection to the fiberglass from water intrusion.
As to whether it will prevent your fiberglass repair from leaking...not necessarily. If you've botched the repair, no amount of paint will make it water tight.
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Sailingdog
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Telstar 28
New England
You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.