1. Probable Cause / Reason
•    Water running off a rusty metal surface onto a painted area below.
•    Contaminated water carries rust particles, leaving stains behind.
•    Often occurs near uncoated or exposed steel parts.
•    The paint film itself is usually fine—only surface-level discoloration.

2. Correction
•    Identify and remove or treat the rust source above the stained area.
•    Clean the stained surface with mild cleaners or rust removers.
•    Repaint the area if cleaning doesn’t restore appearance.
•    Improve drainage or redirect water flow to avoid future staining.

3. Corrective Action / Prevention
•    Design structures to prevent water runoff from rusty surfaces.
•    Regular maintenance to clean and repaint exposed steel areas.
•    Inspect and address rust-prone areas early to prevent staining.

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