In the video, the presenter demonstrates a simple method to check the viscosity or flow of paint.

First, the presenter takes a small amount of paint and pours it onto a flat surface. Then, they tilt the surface to a 45-degree angle and observe how the paint flows down. If the paint flows down smoothly and evenly, it has a good viscosity and flow.

However, if the paint is too thick and does not flow easily or if it is too thin and drips excessively, adjustments may need to be made. To thicken the paint, the presenter suggests adding a small amount of thickening agent or stirring the paint thoroughly. To thin the paint, they recommend adding a small amount of water or paint thinner.

Overall, this method provides a quick and easy way to check the flow and viscosity of paint, allowing for adjustments to be made as needed to achieve the desired paint consistency.

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