I'm not sure, but you could just buy pre-polimerized oil.
Here, just the headstock is painted.
Here, this one was played for a few years buy the owner before I could get it back for these pics, a good example of how oil wears. The body of this is a Danish Oil.
Here, the body is lacquered.
All these.
All these instruments are finished with THIS and THIS, except where otherwise noted.