The ASTM D4285-83 (2018) standard method is used to detect oil or water in compressed air, which is essential in operations such as sand blasting, blast cleaning, and coating construction. Clean compressed air is essential to prevent contamination of coating materials and prepared surfaces. The method determines the presence of oil or water in the air through visual inspection techniques. Miscellaneous contaminants may require additional analytical techniques to detect. The applicability of this standard allows users to ensure that the air mass during construction meets the requirements, thus guaranteeing the mass and performance of coatings.