The only finish that last, stick, and build up on oily woods like teak,
rosewood and cocobolo is Cyanoacrylate(CA) (don't use actual Superglue
it's too thin).

You can google 'CA wood finish' for the procedure. I have not used it on
a boat, but I have been using is for fishing gear (reel seats, and
grips), and wood fishing nets for a couple of years. It's fairly easy to
learn how to apply it as a wood finish.

One warning - it builds quickly and has a thick glossy polyurethane
look. So if you do not like that look do not use it.

Christian

Hello Christian

Just found your contribution in a search as i am in similar process.
First point is CA is super glue, comes in thin, med and thick. I have
used the thin to penetrate some rotten wood in my sailing dinghy and as
a woodworker for 25 years have to recommend Danish oil instead of Teak.
Whatever is used though an oil finish needs a few coats, i thin mine
1:1 with spirit and regular doses after for integrity, but is still
better than the thick laquers which predominate.

David