Used in conjunction with any acrylic medium or acrylic colour that improves the flow, absorption and blending of any water-soluble paint (i.e. acrylic paint), medium, ink or dye. Minimizes brush marks by reducing friction of paint application. Poor adhesion from over thinning of acrylic paint with Liquitex Flow-Aid whilst applying to a non-absorbent surface (i.e. gessoed canvas) can occur. Always make a test piece for your particular application and surface. On non-absorbent surfaces, it will increase the fluidity and open (drying) time of the paint. On absorbent surfaces, will act as a stain, dye or watercolour.