What does it mean for a primer to be 'seacoast worthy'?

A primer described as 'seacoast worthy' is specifically formulated to withstand the challenging conditions typically found in coastal environments, where exposure to saltwater, humidity, and corrosion from ocean breezes are common concerns. This means that the correct answer emphasizes the primer's anti-corrosive properties, which are crucial for protecting surfaces from rust and degradation due to exposure to salty air and moisture.

In coastal areas, materials are at a higher risk of deterioration, making it essential for primers to provide a protective barrier that enhances the longevity of the paint system and the substrate beneath. Prudent use of such primers can significantly reduce maintenance costs and extend the life of painted surfaces in seacoast applications.

The other options indicate characteristics not inherently linked to the specific challenges posed by seacoast environments. For example, resistance to extreme heat or suitability for interior use does not directly address the unique corrosive threats related to saltwater exposure. Similarly, a primer that changes color in response to moisture does not necessarily imply it has any protective qualities against corrosion or other environmental factors required for seacoast applications.