What is classified as a contaminant that can affect paint adhesion?

Water and oil are examples of contaminants that can significantly affect paint adhesion. When these substances are present on a surface prior to painting, they create a barrier between the surface and the paint. This barrier can prevent the paint from properly bonding to the substrate, leading to issues such as peeling, flaking, or blisters.

Effective surface preparation is crucial for good paint adhesion, and this often involves thoroughly cleaning the surface to remove these contaminants. Removing water and oil ensures that the paint has a clean and suitable surface to adhere to, thus promoting durability and longevity of the paint job.

The other options, such as drying agents, polymer resins, and color pigments, are integral components in the formulation and performance of paint rather than contaminants. They contribute to properties like drying time, flexibility, and color but do not serve as barriers that negatively impact adhesion when properly formulated and applied.