What is a typical surface preparation requirement for rubber application?

A typical surface preparation requirement for rubber application is that the steel must be new and free from defects. This is crucial because the performance of rubber coatings heavily depends on the substrate's condition. Any imperfections, such as pitting, rust, or old coatings, can significantly hinder the adhesion of the rubber as well as its performance. New steel surfaces are generally clean and uniform, providing an ideal substrate for rubber applications.

While other options discuss conditions of the steel, they do not align with the optimal preparation standards necessary for effective rubber coating. For instance, having steel with surface rust or existing paint (as mentioned in other choices) can compromise the integrity of the rubber application, leading to potential failures or reduced lifespan of the coating. Therefore, starting with new and defect-free steel ensures that the subsequent layers of rubber can adhere properly and perform as intended.