This video shows adding a thickened lacquer to a couple of small holes. The lacquer is thickened with jinoko without water.  It is like what is sometimes used for making raised areas in makie.  The piece is very close to being finished but there were still a couple of very small holes that needed filling.

For more on traditional, lacquer based kintsugi see kintugi.com or https://www.kintugi.com/?page_id=225