Michael Harding Dammar Glaze Medium is a traditional medium that creates depth and gloss to transparent colours. The added cobalt siccative speeds drying so this medium can be used with slower drying colours. This is the only medium by Michael Harding to speed the drying of oil paint. Michael Harding oil paint mediums have been developed to enhance and facilitate the effects of known oil paint techniques. Throughout history painters have always manipulated paint in search of the perfect paint film and finish. Michael Harding Oil Mediums are fully compatible with Michael Harding oil paints and can guarantee long-term stability.