Winsor & Newton Artists’ Acrylic Flow Improver increases the flow of acrylic colours to enable the application of large areas of colour with consistent strength. Winsor & Newton’s range of Artists’ Acrylic mediums are high-quality formulations designed to complement the Artists’ Acrylic colours range. They bring control and working characteristics without colour shift or loss of depth. Winsor & Newton Artists’ Acrylic Flow Improver will also slow drying.