Extra black covering and adhesive primer to prepare surfaces for painting. Apply on any clean, non-greasy surface. Fast drying. Gesso is a universal primer used to prepare painting surfaces such as canvas, cardboard, wood. Its matt surface improves the adhesion of acrylic or oil paint layers, and is applied on a clean, non-greasy surface using a brush, knife or roller. It can be sanded after application and provides a perfectly smooth surface.