GB/T 31416-2015 "Paints and varnishes—Determination of pot life of multi-component coating systems—Guidelines for sample preparation, conditioning and testing" specifies the standard methods for the preparation, storage, and conditioning of samples for multi-component coating systems. It evaluates the maximum usable time (pot life) after mixing by measuring specific properties. The test requires a container with a capacity of approximately 500 mL, a thermometer accurate to 0.2°C, a conditioning chamber with a heat transfer coefficient ≤25 W/(m·K), and performance testing instruments such as a viscometer, gloss meter, and adhesion tester. The criteria for determining the end point of the pot life vary for different reaction systems. This standard is suitable for the scientific determination of the pot life of coatings in laboratory environments and provides guidance for coating application and quality control.