To see an example to teak refinishing with oil, read this thread from 15-years ago:
https://continuouswave.com/ubb/Forum3/HTML/014322.htmlThat is my boat shown in the thread. I have just now,15-years later, decided that the finish has degraded to the point where it needs to be redone. I think that refinishing the oiled wood once every 15-years is not too onerous a task.
At some point I changed to using WATCO TEAK OIL. I found that product was a better and more durable teak oil.
There are many prior threads on these topics.
The most interesting element of this current thread is the mention of the penetrating epoxy sealer product. But that method seems only useful if you switch to a varnish finish FOREVER. Once the epoxy resin gets into the wood it won’t ever come out. Keep that in mind before heading down that path to your wood care.
With a high-gloss varnish finish there is a loss of utility. For example, on a real show-boat full of glossy varnished wood, the owner only allows people to come aboard barefoot. That is a bit crazy, if you ask me. A wet glossy varnish surface will be slippery.
Yes, I know real old-time sailor men worked in bare feet—but not an varnished wood surfaces.