Atelier Binder Medium is a water based emulsion, which can be used straight from the bottle or thinned with water 1:1 to seal most surfaces. Atelier Binder Medium can be used as a sizing on canvas or cotton duck to seal the surface and prevent absorption of paint into the fabric. Binder Medium toughens paint to return Interactive back to a more conventional acrylic. Mix with paint to dilute colour without losing intensity, use neat between dry paint layers to seal and mix with paint to create a more glossy acrylic.