What is the primary purpose of a primer in painting?

The primary purpose of a primer in painting is to improve adhesion. Primers are specially formulated coatings applied to surfaces before the paint layer is added. They create a binding layer that enhances the paint's ability to stick to the surface, which is particularly important on surfaces that might otherwise be difficult for paint to adhere to, such as metal or glossy finishes.

Using a primer helps to ensure that the paint goes on evenly and reduces the risk of peeling or chipping over time. Additionally, primers can help seal the surface and prevent stains or other materials from bleeding through the topcoat. The role of a primer is foundational for achieving a durable and lasting finish, making it an essential step in the painting process.

While some might assume that a primer's job includes functions like speeding up drying time, enhancing sheen, or simply adding color, these are secondary benefits or misconceptions about its role. The focus is primarily on enhancing adhesion, which sets the proper groundwork for the subsequent layers of paint.