T2x will know best on what was used.
I don't believe they were built with epoxy, but you can't go wrong with restoring it with epoxy. It will certainly get a better secondary bond than any other resin out there.
If you don't want to use that, then at the very least use Vinyl-Ester. It is an epoxy based resin.
Also, visit my website and look on the BOAT BUILDING page. There should be several helpful LINKS for you there.