What are Ultraviolet lights utilized for in coating inspection?

Ultraviolet lights are particularly effective for detecting hydrocarbon contaminants such as oil and grease on surfaces prior to coating applications. This is due to the fact that certain contaminants fluoresce under UV light, thereby making them easier to spot during the inspection process. Identifying those contaminants is crucial because they can interfere with the adhesion of coatings if not properly removed. This detection capability allows inspectors to ensure that surfaces are clean and suitable for coating application, which is essential for achieving a successful and lasting finish.

While ultraviolet lights can aid visibility in some contexts and may indirectly help identify surface irregularities, their primary and most relevant use in coating inspections pertains to the detection of contaminants that could impair coating performance. The ability to spot these hydrocarbon substances under UV light is a key advantage in preparation and inspection protocols.