Matisse Acrylic Medium MM6 - Polymer Matt Varnish 250ml. Matisse Polymer Matt Varnish can be used as a final varnish over a dried, well-cured acrylic painting when a flat, matt or very low sheen is required (and the use of MM15 Matt Varnish (turps-based) is not appropriate). Most suitable as a protective coating, particularly over significant works exposed to damage in public galleries, commercial paintings required for floodlit photographic reproduction and paintings that would be improved by eliminating unbalanced glossy highlights. Although white, MM6 Polymer Matt Vanish dries completely clear and is non-yellowing. It is recommended that this product be stirred thoroughly before application, as it contains a matting agent that can settle at the bottom of the container. Avoid shaking the container, as this can cause bubbles that may affect the finish. Do not allow it to freeze. A minimum of two coats is recommended for a consistent matt finish. MM6 Polymer Matt Vanish is not suitable for use over oil paints. Drying time is approximately 1-2 hours (leave 24 hours before re-coating), depending upon weather conditions. Do not attempt to speed the drying process.