Matisse offer a broad range of permanent flexible primers and Gesso for canvas, board or even paper. Mattise Gesso is an intense white ground with an excellent tooth for easy paint manipulation. Matisse Gesso is a water-based product and can be thinned down with water. Use equal parts of water to Matisse Gesso when working on raw canvas/linen. If working on canvas, Matisse Gesso will tighten the canvas, making a firmer ground to paint on.