When an artist applies pigments to plaster after the plaster mixture has dried, the paint does not bond with the wall and the paint will eventually flake away. What is this method of painting called

Fresco-secco

Explanation:

I looked it up and this is what came up. Hopefully that may help. it can also just be called just fresco painting

i believe their role is to instruct certain sections on when they are to join and when they are to stop