I recently made myself a brush handle from white oak with a walnut stain and used four coats of Tru-Oil Gun Stock Finish for the topcoat. After a few weeks of use, the finish has a dull, flat look. I rinse it thoroughly after each use. My original thinking was that a penetrating oil would provide deeper protection against the water. But now I think maybe a varnish that lays on the surface may be a better choice. Sometimes I will want to rub it to a high gloss look, and sometimes I prefer a matte or satin look. What do you use/recommend for a durable high gloss or satin finish on wood brush handles?