Cosmic Shimmer White Gesso Primer. This opaque primer can be applied by brush or roller and can be used on paper, card, canvas, MDF, wood and many more surfaces. Gesso is used as a primer to prepare many different surfaces for paint, ink etc. Gesso dries to a hard finish making softer surfaces such as canvas stiffer. It creates a slightly textured surface which will more readily accept paint and ink etc. This is a 150ml tub of white gesso.