Daily ART Drying Time Extender is a water-based medium that extends the drying and blending of a water based acrylic paint. Helps make blending and stroke work easier.As acrylic paint dries quickly artists and decorators often wish to have longer working time to create complex effects. Add 5 to 30% of Extender to paint, depending on how much more time you need to work on your project. Adding 30% will prolong drying time up to 4 hours depending on the thickness of the layer.