What is the minimum number of primer coats required on topside metal surfaces that have been stripped down to bare metal?

For topside metal surfaces that have been stripped down to bare metal, the minimum requirement is to apply two primer coats. This approach ensures that the bare metal is adequately protected from corrosion and environmental damage. The first coat acts as a bonding agent, providing a surface for the subsequent layers to adhere to effectively. The second coat serves as a reinforcement, enhancing the protective barrier against rust, moisture, and other corrosive elements. Additionally, having two coats allows for better coverage and uniformity in the paint application, which is crucial in maintaining the longevity and appearance of the surface.

Applying just one coat may not provide sufficient protection or durability, as it might not cover all areas completely or bond adequately, leading to potential issues down the line. More than two coats, although potentially beneficial for certain conditions, would exceed the minimum requirement and could be unnecessary for standard applications. Therefore, two primer coats are both the minimum standard and practical for ensuring optimal protection and performance of bare metal surfaces.