What is the primary role of a paint primer?

The primary role of a paint primer is to aid adhesion to the substrate. Primers are specifically formulated to create a surface that allows the topcoat of paint to bond effectively. This improves the overall paint job by ensuring that the paint adheres properly, which can prevent issues like peeling or chipping.

Using a primer is particularly important when painting surfaces that may be challenging for paint to adhere to, such as glossy finishes, bare wood, or metals. Primers often contain binding agents and have properties that can penetrate the surface, creating a more stable foundation for the paint. While some primers can enhance gloss, offer UV protection, or provide a base color, their fundamental purpose remains focused on enhancing adhesion, ensuring longevity, and promoting even application of the topcoat.