Matisse Artist Polymer Varnish Satin MM28 serves both as a satin finishing varnish and as a glossy satin additive to the paint. Mixed with Acrylic Colours, it increases gloss and flow characteristics. Used as a finishing varnish, it produces a strong, protective, tack-free, clear film. Polymer water-based varnishes may appear to be slightly hazy whilst in solution. This is an optical effect produced by light refraction of acrylic particles suspended within the water-based medium. The effect disappears when the film is dry. As acrylics dry very rapidly, care should be taken to apply varnish pre-diluted with water. Polymer Varnish, applied in very thick layers on a hot day, could trap moisture, resulting in a cloudy film which would be very difficult to correct. All Matisse painting mediums are freely intermixable, e.g. Polymer Gloss Varnish will intermix with MM6 Matt Varnish to give a subdued gloss effect; MM8 Spreader Medium will intermix with the above to offer various degrees of water resistance and flow. Nevertheless, painters are advised to use some discretion in pre-determining their selection of mediums to avoid accidentally eliminating their intrinsic qualities or beneficial effects, e.g. artists using MM5 Matt Medium would be ill-advised to finish their painting with a Polymer Gloss Varnish.