DUO Aqua Oil Quick Drying Liquid enhances transparency and gloss finish while dramatically accelerating drying time. If mixed with DUO Aqua Oil Color in equal parts (not to exceed 50%), the substrate surface will become tacky in as little as 30 minutes. It can also be thinned with water, however, the overall effect will be reduced. Over time, the medium may become cloudy, but its performance will not be affected. Excellent for impasto techniques and knife painting.