A pouring medium is a liquid additive that is mixed with acrylic paints to help them flow more easily and create a smoother, more cohesive surface when applied to a canvas or other surface. Pouring mediums are designed to reduce the viscosity of the paint, making it more fluid and easier to pour. They also help to prevent the paint from separating and create a more even, glossy finish.

To use a pouring medium, you simply mix it with your acrylic paints in a ratio recommended by the manufacturer. The exact ratio will depend on the specific pouring medium you are using and the consistency of paint you want to achieve. Some pouring mediums also have a binder added, which helps the paint to adhere to the canvas and reduces the risk of it cracking or peeling once it is dry.

In addition to pouring mediums, there are also other additives that can be mixed with acrylic paints to achieve different effects. For example, you can use a flow aid to increase the flow of the paint and reduce the risk of it getting stuck in the nozzle of the bottle. You can also use a retarder to slow down the drying time of the paint, which can be useful for achieving certain effects or working with large quantities of paint.

There are many pouring mediums available on the market, and different brands and formulations can produce slightly different results. Some of the most popular pouring mediums include:

1. Floetrol: This is a popular pouring medium that is often used by artists because it is widely available and relatively inexpensive. It is a water-based additive that is designed to improve the flow and workability of latex paints, but it can also be used with acrylics. Floetrol helps to reduce brush and roller marks and creates a smooth, even finish.
2. Liquitex Pouring Medium: This is a professional-grade pouring medium made by the well-known brand Liquitex. It is designed specifically for use with acrylic paints and helps to create a glossy, fluid finish. It is also self-leveling, which means it helps the paint to spread out evenly and reduces the risk of drips and runs.
3. Pebeo Studio Acrylic Pouring Medium: This pouring medium is made by the French brand Pebeo and is designed for use with their Studio Acrylic paints. It is a highly fluid medium that helps to create a glossy, flowing finish and is self-leveling.
4. Golden GAC 800: This is a professional-grade pouring medium made by the brand Golden. It is a more viscous medium that is designed to create a glossy, smooth finish and is self-leveling. It is also resistant to yellowing over time, making it a good choice for preserving the vibrancy of your colors.
5. GAC 100: This is another professional-grade pouring medium made by Golden. It is a more fluid medium that is designed to create a very glossy, flowing finish. It is also resistant to yellowing and dries to a clear, transparent finish.