5x7 oil on Venetian plaster on birch
I have a bucket of the genuine Venetian plaster and love to paint on it from time to time. I apply a good amount the plaster on the birch board spread out with a large palette knife as smooth as I can get it then let it dry. After it has dried usually takes a day or two I then sand it with fine grit sandpaper. I am ready to paint after a nice sanding.