I did this today at the jetty park, it is 5 x 7 inches in acrylic on masonite. Mostly painted with the painting knife. They are Golden Open acrylics, I got them from the company to try them out. I liked them a lot, very bright colors. These are just the three primary colors and white. These acrylics stay wet longer, in today's conditions regular acrylics would have dried very fast. Normally I paint in oils but this was a fun change.