I think an important note here is [i have been told] - woods with a high oil content , like teak are difficult to coat with anything that makes an airtight seal , like epoxy or varnish .
I made my own gun over christmas out of iroko , which is similar to teak.
I cant for the life of me get a good coat with epoxy

! and to be honest i doupt i could get a coat with varnish either.
Also something thats happened recently is that white/dull patches are developing between the epoxy layer and the wood .
Im thinking of stripping all the epoxy off - and finding a suitable oil possibly,well, not untill next winter anyway

What im saying is - make sure your finishing method is suitable for the wood.