Matisse Painting Medium is a low viscosity acrylic binder. It is primarily used as a paint dilutant when not using water. Water may be used with Matisse colours. However, adding more than 30-50% will not only reduce the colour strength (which is usually the desired result) but will also reduce the binding capacity of the colours.
This medium is also suitable to use as a transparent primer or surface conditioner for canvas, paper or board.