What is the difference between an adhesion promoter and a plastic primer?

An adhesion promoter is specifically designed to enhance the bonding of paint to challenging surfaces, particularly those that are difficult for paint to adhere to, such as plastics and certain coatings. It prepares the surface to maximize paint adhesion, ensuring a durable finish. While a primer also plays a vital role in preparing surfaces for painting, its main function is not solely to enhance adhesion but rather to create an even, uniform surface for the paint, offering benefits like sealing the substrate, hiding repairs, and providing a stable base for the topcoat.

In this context, the option highlights that the adhesion promoter focuses on improving the adherence of paint, while the primer's function extends to resurfacing or preparing repaired areas for cosmetic finishes. This distinction is important because while both are utilized to ensure a successful paint application, their functions target different aspects of surface preparation. The use of both can be crucial for achieving a high-quality result in painting and refinishing tasks.