In 2012 I went out twice to watch artists demonstrate their technique of painting wet on wet. I think it’s called ala prima. They get a finished painting in a few hours. At York Academy of Art they told us it’s difficult, and that we need to work out all our color choices in roughs before starting on the canvas, if we want to paint wet on wet.
Both of those artists talked about the problem of paint getting overworked and the colors getting muddy. Also both of them tinted the canvas at the start of the demonstration. Why not tint the canvas the day before and start on a dry ground ? I didn’t ask.