DUO Painting Oil Medium enhances transparency and gloss finish while accelerating drying time. Aids in brush ability and flow. Great for detail. Use DUO Painting Oil Medium alone or with water. Adding water may produce a milky appearance which will become clear once dry. DUO Linseed Oil can be added for stronger surface finish during final layers of painting. While Painting Oil Medium may become cloudy over time, performance will bot be affected. Store in a cool dark place.