Which of the following is not a main component of a typical coating formulation?

In a typical coating formulation, there are several core components that contribute to the properties and performance of the coating. Resins are crucial as they act as the binder, providing adhesion to the surface and contributing to the film integrity. Solvents play a significant role in dissolving the resins and adjusting the viscosity of the formulation for application ease. Pigments are important as they provide color and opacity, and can also contribute to other properties such as corrosion resistance or UV protection.

Plastics, however, are not considered a main component of a typical coating formulation. While some coatings might use plastic materials in certain applications, such as in heavy-duty or specialized formulations, they are not a fundamental component like resins, solvents, or pigments. Therefore, the correct choice highlights that plastics do not belong to the essential group of components necessary for a standard coating formulation.