Pouring mediums are used to increase the flow of acrylic ink and fluid acrylic colour so that they can be used for pour painting. This exciting technique involves pouring pre-mixed acrylic and medium over a canvas or board to create stunning, oscillating waves. Choosing a pouring medium is important in deciding what effect you’re going for and combining separate mixes on your substrate can also lead to interesting effects. Most pouring mediums dry to a clear, glossy, waterproof finish.