Which statement is true regarding coatings on exposed sprinkler surfaces?

Which statement is true regarding coatings on exposed sprinkler surfaces?

• A. Coating is prohibited on exposed surfaces.
• B. Any coating is acceptable on exposed surfaces.
• C. Apply protective coating to exposed surfaces.
• D. Coating must be applied only to interior surfaces.

Answer: (C)

Coatings can be used on exposed sprinkler surfaces when they are protective coatings that have been approved for sprinkler use and are applied to the exterior surfaces. This protects the metal from corrosion in humid or harsh environments without compromising performance, as long as the coating does not cover critical features such as the heat-sensing element, the discharge path, or any identifying markings. In other words, protective coatings are acceptable, but only those approved for sprinklers and applied in a way that preserves function and visibility.