This video shows polishing keshifun gold with both mawata and a polishing tool.  It isn’t necessary to do so but on occasion I do to slightly change the look of the piece.  The piece is an ancient clay figure of a cow where I reconstrusted the horn and ear.
For more on metal finishing refer to this page, https://www.kintugi.com/?page_id=80
For more on traditional, lacquer based kintsugi see kintugi.com