Exterior Duct Coating Is Damaged by Slings or Handling

Fast answer

Protect the damaged area from weather and contamination, then verify the approved coating-repair system before touching it up. The repair must match the substrate, coating, preparation, and environmental conditions.

What to check

1. Photograph the damage before cleaning it.
2. Identify the duct material and coating system.
3. Check whether metal is exposed or deformed.
4. Verify surface preparation, repair material, cure conditions, and inspection requirements.

Do not

Do not use random spray paint, mastic, or roof coating as a cosmetic cover.

Ask the foreman

“The sling rubbed through the exterior coating to bare metal at two points. I documented the locations and coating type. What approved repair system and inspection do you want before this section is installed?”

Why it matters

An incompatible patch can trap moisture, fail adhesion, hide deeper damage, or void the specified coating system.