I posted a couple of videos on my Art E Studio Instagram page as an example of how this technique works. The sound is turned off in the video because of background noise I have no control of.
I'm offering classes on how to do this in the near future. The classes will be on Friday afternoons only and will be limited to two students at a time.
Note; The top four paintings are done on round canvases. The black or white backgrounds were added for printing. Clicking on each image will take you to my art website.