What is the primary purpose of an adhesion promoter in plastic repairs?

The primary purpose of an adhesion promoter in plastic repairs is to enhance bonding with adhesives. When working with different types of plastics, their surfaces may have characteristics that make it difficult for adhesives to bond effectively. An adhesion promoter works by modifying the surface of the plastic to increase the surface energy, allowing adhesives to create a stronger bond. This is particularly important because a strong adhesion is crucial for ensuring the repaired components maintain their integrity and function properly over time.

While strengthening the plastic itself may seem beneficial, it is not the primary function of an adhesion promoter. Similarly, improving color matching and preventing warping are important considerations in plastic repairs, but they do not directly relate to the bonding capabilities provided by an adhesion promoter. Therefore, the correct answer highlights the essential role of adhesion promoters in ensuring that adhesives bond securely to plastic surfaces during repairs.