The ASTM D3928-00a (2018) standard test method is used to evaluate the Glossiness and Gloss uniformity of coatings, especially in large area applications. This method is designed to address Gloss differences that may occur on the coating surface due to uneven application, film thickness changes, or repair areas. By measuring the Gloss change of the coating, it is possible to evaluate whether the Coating can maintain a consistent Appearance between different Spreader areas, avoiding significant Gloss unevenness or brush marks. This method has practical implications for improving the visual conformity of the Coating after construction and helps determine whether the Coating can maintain a uniform Gloss effect when repairing.