Matisse Drying Retarder will slow the evaporation of water from the paint. However, excess amounts of Drying Retarder (over 10%) will severely slow “cross linking” of the acrylic. Therefore, even though the paint may look dry, it will not have “cross linked” or “cured” so it is able to be re-wet, i.e. with a wet brush or cloth. Matisse Drying Retarder may be used in watercolouring, water wash effects, stain painting and hard edge techniques where it assists in pigment wetting, rapid colour diffusion and penetration. On raw canvas, the addition of 3-5% Drying Retarder, pre-diluted with water, will improve the mixing of inorganic pigments, oxides, earth colours, titanium dioxide and metallic pigments.