What is the effect of exposing lacquers, oil-based paint, plastic resins, and vinyl compounds to phosphate-ester-based hydraulic fluid?

Exposing lacquers, oil-based paint, plastic resins, and vinyl compounds to phosphate-ester-based hydraulic fluid leads to damage or softening of these materials. Phosphate-esters are known to be highly aggressive solvents that can penetrate and chemically degrade certain types of coatings and plastics. This degradation occurs because these materials are not chemically compatible with the hydraulic fluid, resulting in swelling, softening, or complete deterioration. Thus, the integrity and finish of the painted or coated surfaces can be compromised, which is critical to understand when dealing with aircraft maintenance and safety protocols.