Matisse Acrylic Medium MM27 - Low Viscosity Gesso 1L. Matisse MM27 Low Viscosity Gesso has been specially formulated for those artists who prefer a lower viscosity gesso. It has all the outstanding properties of the original MM10 Matisse Gesso formula including a bright white colour, soft tooth and flat finish however, MM27 has a softer, creamier texture making it easier to brush out and manipulate with a knife. We recommend always applying 2 coats of gesso (more if necessary) to your substrate for maximum adhesion and protection of the surface painting.