👉 A fluid applied to a surface, such as a liquid or a paste, is used to coat, protect, or enhance the properties of that surface. In various applications, from automotive to construction and medical fields, fluid application can involve processes like spraying, brushing, or pouring. Fluids can serve multiple purposes: they can provide lubrication, seal gaps, protect against corrosion, or even deliver active ingredients for cleaning and maintenance. The choice of fluid depends on the specific needs of the task, ensuring optimal performance and longevity of the treated material.