The ISO 9514-2019 standard specifies a method for evaluating the preparation, storage and shelf life of samples of multi-component Coating systems. The standard aims to determine the shelf life of Coatings by controlling the preparation and storage conditions of the samples and simulating the situation in actual use. The shelf life refers to the maximum time that Coatings maintain good performance after mixing. The method can be used to evaluate the characteristic performance of Coatings over a specified time period, providing a reference for the actual use of Coatings. Updates to the standard include the removal of descriptions of specific coating systems, simplification of terms, and revision of relevant information in test reports.