Tamar is a youtube star. That's all I know. She doesn't pretend to be expert anything. Her motto is "learn on the fly."
She gets tools for free. The industry hopes to get women interested in wood working. She seems to be doing it. More power to her. I mostly like that finish. The way she did it is too thick for a boat finish. But something...........might work.
Mix pigment with thin epoxy. Dribble contrasting colors on semi-randomly. Hit it with the hot air gun to make it mix in weird ways.