The ASTM D7356/D7356M-19 standard provides an experimental method for accelerating the acid etching of automotive varnishes. This method accelerates the assessment of acid corrosion damage to automotive exterior coatings by using a Xenon-arc Light source to simulate an acid rain environment. The significance of this test method is that by simulating the acid rain environment in Florida, it can be tested under laboratory conditions all year round, compensating for seasonal limitations in practical outdoor testing. The standard also emphasizes the use of horizontal sample arrays and simulated acid rain solutions to ensure the accuracy and repeatability of test results.