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Let’s discuss the importance of conducting natural environment tests on coatings. The results of accelerated testing on coatings do not necessarily correspond exactly to those obtained from exposure to the natural atmosphere or from actual use; therefore, when testing the quality of industrial anti-corrosion coatings, it is best to carry out tests under natural environmental conditions. When conducting natural environment tests, it is necessary to pay attention not only to the accuracy of the test results but also to the correlation between the results of natural environment tests and those of artificial accelerated tests. Developing reliable acceleration test methods and exploring corrosion prevention mechanisms provide a basis for improving the quality of anti-corrosion coatings. Natural environment testing includes three aspects: outdoor atmospheric exposure testing, exposure under a shelter and in a warehouse, as well as storage under a shelter and in a warehouse. Among these, outdoor atmospheric exposure testing is used quite frequently in the quality assessment of anti-corrosion coatings. The outdoor atmospheric exposure test involves exposing painted samples directly to the outdoor atmosphere, subjecting them to the combined effects of various atmospheric factors. Through periodic visual inspections as well as tests on other physical, mechanical, or chemical properties, the weather resistance of the coating film can be evaluated. This test can also be compared with artificial acceleration tests in order to determine the relationship between the two.