Rheotech acrylic paints are fully compatible with each other and other Tri-Art acrylic paints and mediums. Do not mix with oil paints, solvent based paints or inks. Application to oily or greasy surfaces is not recommended as this will compromise adhesion and paint film integrity. The flexible, water fast nature of Rheotech acrylics allow for versatility in application on a variety of surfaces, e.g. paper, wood, clay, plaster etc. Rheotech gesso is the recommend primer for most surfaces.