I've used Min-Wax Quick Dry Polyurethane on interior teak. Easy to work with and it looks grreat. Does a good job of protecting the wood, too. Use the gloss level you want. I don't recommend teak oil for anything, but that's just me. It turns dark and I think it's the favorite food of mold and mildew. Varnish would be a second choice. Epoxy is overkill for the interior.
FYI -- I have used Min-Wax Rub-On Poly to touch up the varnish job on my current boat's interior wood. Easy application and it really makes the wood look sharp.
SailorMitchSailing winged keels since 1989.
1.20.09 Bush's last day the end of an error !! Hopefully we still have a constitution and economy left by then.
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