This standard comprehensively specifies a unified procedure for preparing paint film test panels under laboratory conditions for performance testing, aiming to ensure consistency and comparability of test results from different sources. As the "fundamental operational specification" for paint testing, it integrates common laboratory coating methods such as brushing, spraying, dipping, and scraping, and provides clear requirements for key variables such as substrate treatment, drying conditions, and film thickness. To meet the high standards of precision and reproducibility demanded by the modern paint industry, the standard specifically introduces high-precision automated equipment such as automatic coaters, wire-wound applicators, and gap-type wet film preparators. These tools eliminate manual operation errors, ensuring that the prepared paint films are uniform and have controllable thickness, thereby laying a solid foundation for the accurate evaluation of various physicochemical properties such as abrasion resistance and impact resistance.