Here's my usual process on walnut.
1) de-whisker the wood (water, heat, steel wool).
2) An oil finish like tung oil, BLO, watco. Soak the surface, let sit for a bit then wipe off. Let that dry.
3) Fill the pores - I use a commercial filler.
4) Spar varnish (high gloss). As many coats as...