Coating inspection is typically performed by visually inspecting the surface to ensure that it meets the specified requirements and standards. This can involve looking for defects such as bubbles, cracks, or other irregularities in the coating. In some cases, more advanced techniques such as infrared imaging or ultrasonic testing may be used to identify problems with the coating that are not visible to the naked eye. Ultimately, the specific methods used for coating inspection will depend on the type of coating, the surface it is being applied to, and the specific requirements and standards that must be met.

A holiday detector is a tool used in the process of coating a surface to detect holidays, or areas where the coating has not been applied properly. This is typically done by applying a high-voltage current to the coated surface and using a specialized instrument to detect areas where the current is not flowing properly, indicating that there is a gap or hole in the coating. Holiday detectors are commonly used in the construction and maintenance of pipelines, tanks, and other industrial structures to ensure that the coating has been applied properly and will provide the necessary protection to the underlying surface.