What is the purpose of using a primer before painting?

Using a primer before painting serves several important functions that significantly enhance the overall outcome of a painting project. The primary purpose of applying a primer is to improve adhesion and durability of the topcoat.

When applied to a surface, primer creates a better bonding layer for the paint, which helps the topcoat adhere more effectively. This adhesion is particularly vital when painting surfaces that are porous, such as bare wood or drywall, where the paint could soak in unevenly if applied directly. Additionally, primer often seals porous materials, which prevents the topcoat from being absorbed too much by the substrate, ensuring a more uniform appearance and color application.

Primer can also contribute to the durability of the finish. A well-prepared surface with primer provides a stable base that can withstand wear and environmental factors better than paint alone. This can lead to longer-lasting results, reducing the need for touch-ups or repaints.

The other options, while they may touch upon certain attributes related to paint, do not accurately define the core reason for using primer in a painting process. Adding color to paint does not align with the primary purpose of primer, nor does making paint glossy or decreasing drying time. Primers are typically formulated for optimal adhesion and to set the stage for the topcoat to