Postcoat

Postcoat refers to a material applied to a surface after a primary coating has been cured or dried. Its purpose is to enhance the properties of the initial coating or the substrate itself. This secondary application can serve various functions, such as improving durability, adding aesthetic appeal, providing additional protection against environmental factors, or facilitating specific post-application processes.

Common types of postcoats include clear topcoats, which add gloss or a matte finish and protect the underlying layer from scratches and UV radiation. Protective sealants are another form, often used on metals to prevent corrosion or on porous materials to repel moisture. In some applications, postcoats are used to alter the surface texture, making it smoother or rougher for improved grip or aesthetic reasons.

The application methods for postcoats vary depending on the material and substrate. They can be sprayed, brushed, rolled, or dipped. Curing processes for postcoats also differ, ranging from air drying to UV curing or heat treatment. The selection of a postcoat depends on the desired outcome, the compatibility with the primary coating, and the intended use of the coated object. Understanding the role and properties of postcoats is essential in many manufacturing and finishing processes.