Winsor & Newton offers an extended range of watercolour, acrylic, oil and oil water mixable mediums & products to take care of your tools. From Watercolour Masking Fluid to Gum Arabic for watercolours, to Liquin and Linseed oil to slow or extend the drying speed for oil paints and use acrylic mediums to manipulate the drying time, sheen, texture or transparency of your acrylic paints.