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Coating failure refers to the loss or reduction of the adhesion strength between the coating and the substrate. Premature coating failure refers to the situation in which a coating fails before reaching its expected service life, and the failure of anti-corrosion coatings generally comes with suddenness and severe adverse effects. When the coating fails, measures need to be taken to help it return to a level where it can perform normally. How does coating failure occur? The manifestations of coating failure include the protective coating’s inability to protect the substrate, its failure to provide a good appearance, or its inability to fulfill other intended functions. A typical coating system can serve multiple functions; it can typically act as a water-impermeable layer, providing strong protection for the substrate, maintaining its integrity in terms of adhesion throughout the service life of the thin layer, and resisting atmospheric and chemical degradation. The period of time during which a coating can withstand various stresses and strains while maintaining its adhesion strength is determined by the initial adhesion strength between the coating and the substrate, as well as the environment to which the coating is exposed. The onset of coating failure is usually slow, but once it begins, it spreads rapidly, preventing the intended benefits of using expensive coating systems from being achieved. Coating failure can take various forms, most of which are characterized by the peeling off of paint or the coating itself. Data shows that the vast majority of coating failures are caused by inadequate surface treatment and surface application. Generally, coating failure is caused by a combination of various factors, and professional investigation is required to determine the causes.