Architectural Flashing Supply
Start a Quote
Coil handling and finish protection · Lesson 4 of 4

Coil handling and finish protection: defects, verification and case study

Seven finish defects and what to do about each, what touch-up paint can and cannot do, two fatal coil-handling cases, and the record that shows a coil was handled right.

You will be able to: Identify a finish or handling defect from its mark, choose a corrective option within the supplier's and MCA's limits, and document the evidence a reviewer needs.

11 min · 12 slides · 9 questions

All lessons in this module
Slide 1 of 12

Read the mark, then the cause

Seven marks a coil or piece can show:

  • Scratch or gouge through the paint
  • Film baked on
  • White rust on galvanized
  • Grey-to-black stain on Galvalume
  • Fretting marks
  • Swarf rust specks
  • Fingerprints and skin-oil stain
Finish defect identifierSeven numbered tiles, each with a red swatch showing a schematic mark and its name: a jagged scratch line, wrinkled film stuck on, white powdery spots, grey-black streaks, short black rubbing marks, small rust specks, and a fingerprint. The eighth tile says: record a photo, the coil ID, the location and the supplier consulted.Scratchor gougeFilmbaked onWhite rust,galvanizedGrey-blackstain,GalvalumeFrettingmarksSwarfrustspecksFinger-prints,skin oilRecord every one:a photo, the coil ID,where it was foundand the supplierconsulted1234567

Seven tiles, each a schematic of a mark on a red panel: a scratch line, film puckered and stuck, white powdery spots, grey-black streaks, short black rubbing marks, small rust specks, and a fingerprint. A footer reads: record a photo, the coil ID, the location and the supplier consulted.

1
Scratch or gouge: handling or a rough contact point. Small scratch that does not gouge into the substrate: touch up within MCA's and the supplier's limits; a gouge or large area: remake
2
Film baked on: left on in sun or heat. Ask the film or coil supplier
3
White rust on galvanized: wet, touching surfaces. Separate, dry, ventilate
4
Grey-to-black stain on Galvalume: moisture between laps or sheets. Separate, dry, ventilate
5
Fretting: load and small movement in transit. Mainly cosmetic; record it
6
Swarf rust specks: cutting or drilling debris left on. Sweep as you go; never steel wool
7
Fingerprints or skin-oil stain: bare or dirty hands. Clean, dry gloves
Schematics, not photographs. Causes and first actions are in the legend; fretting is mainly cosmetic (GalvInfo).

Sources

Videos for this lesson

What this video shows: Sheffield Metals on when to use touch-up paint and when not to, pens and spray cans, air-dry products only, and why touched-up areas are not under the paint warranty.

Video: What are the Best Touch-Up Paint Products for Metal Roofing Scratches? by The Metal Roofing Channel, on YouTube. Chosen from the video's published description.

Glossary

Touch-up paint
A field-applied air-dry paint for small finish damage; it does not restore the factory finish or its warranty.
Substrate
The metal under the paint and metallic coating.
Adhesion tape test
MCA's check that touch-up has bonded, made 24 hours after application.
FACE report
A NIOSH or state Fatality Assessment and Control Evaluation report on a workplace death, with prevention recommendations.