Winsor & Newton Professional Acrylic Medium Flow Improver maintains no color shift from wet to dry when used with Professional Acrylic. It increases the flow of color allowing the application of areas of flat, even color without changing color strength. It also maintains the stability of color and slightly slows drying. Effective for hard edge painting techniques. Details:Available in multiple sizesIncreases the flow of acrylic colorsEffective for hard edge painting techniquesFor use with Winsor & Newton Professional Acrylic Paint