The crossword solution for the term ARTIST PASTE is GESSO, which is a type of paint medium used by artists. It is a white, chalky substance made from calcium carbonate or gypsum mixed with an adhesive, usually glue. Gesso is often used as a primer for painting on canvas, wood, or other surfaces. It provides a smooth, absorbent surface for the paint to adhere to and can also be used to create texture and patterns.