Flow Aid additive improves flow, absorbency and blending. Dramatically increase the flow of your color/mediums while minimizing brush strokes. Use with acrylic paints & mediums Use on all acrylic-friendly surfaces. Techniques include flow art, colour washing, watercolor techniques, staining & bleeding effects. Light fast & archival. Permanent non-yellowing, flexible & non-cracking. Water-resistant when dry. Intermixable with all Liquitex materials. Sizes 4oz/118ml.