What is another use for graduated mixing sticks?

Graduated mixing sticks are primarily designed to measure specific volumes of liquids when mixing paint and solvents. In the context of paint preparation, the addition of solvent is crucial for achieving the desired viscosity or thinning the paint to a workable consistency. The graduations on the sticks allow for accurate measurement, ensuring that the proper amount of solvent is added to the paint. This precision is essential for maintaining the quality and performance of the paint after application.

While other options mention applications that are relevant in the painting and refinishing process, they do not align with the primary function of graduated mixing sticks. Measuring air pressure, stirring paint, and testing paint thickness involve different tools and methods that are not related to the specific use of graduated mixing sticks.