Why do paint manufacturers require a drying system on compressed air supply?

Paint manufacturers require a drying system on the compressed air supply primarily because moisture in the air can lead to contamination of the paint. Water vapor can cause various issues such as bubbling, runs, or poor adhesion when the paint is applied. This contamination can compromise the quality of the finish, leading to defects that are not acceptable in professional painting jobs.

To maintain the integrity of the finish and ensure that the paint adheres properly, manufacturers stipulate that the compressed air used in the painting process must be dry. If moisture is present in the air supply, it can lead to defects in the paint application, ultimately affecting the performance and durability of the paint job. Hence, qualifying for factory paint warranty coverage is contingent upon using a proper drying system to prevent these issues related to moisture contamination.