Winsor & Newton Oil Mediums are a range of professional-grade additives and modifiers designed to enhance the handling, finish, and drying properties of oil paints. These mediums can thin paint for smoother application, improve flow and transparency, speed up or slow down drying time, increase gloss or matte effects, and support glazing and layering techniques. Suitable for students through to professional painters, Winsor & Newton Oil Mediums help you refine texture, control brushwork, and achieve consistent, high-quality results in oil painting.