Michael Harding Dammar Glaze Medium 250ml will add depth and gloss to transparent oil colours and also speed drying. Michael Harding mediums are unique formulations based on ingredients dating back to the 13th century, using natural materials such as resins, waxes and balsams. This contains cobalt as a siccative (drying agent), as well as Indonesian dammar resin with double rectified turpentine which evaporates more slowly than the usual mastic resin. Adding just 10-20% Michael Harding Dammar Glaze Medium will speed the drying of oil paints, while you can also add this in a proportion of 1:1 to any other Michael Harding medium. UK shipping by road only. Not available for International or Northern Ireland delivery.