What is the function of primer on pipes?

The primary function of primer on pipes, especially in plumbing involving PVC and ABS materials, is to prepare the surface for bonding. While the choice identified as a catalyst might seem appealing, primer actually serves as a cleaner and a surface preparer rather than acting as a catalyst in the chemical sense.

When primer is applied to the surface of a pipe, it cleans and softens the material, allowing the adhesive or cement to form a stronger bond once it is applied. The primer effectively removes dirt, oil, and other contaminants that can hinder the bonding process and ensures that the surfaces of the pipe and fitting are ready for the cement, leading to a watertight seal.

The options involving cleaning surfaces, enhancing color, and providing lubrication address different functionalities. While primer does contribute to cleaning, enhancing color is not its purpose, since primer is typically clear or colored to indicate use, and lubrication is not a characteristic associated with primer at all. Understanding the role of primer as a preparatory agent is crucial for ensuring effective plumbing installations.