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Various Defects in Industrial coating – An Article dedicated to people committed to coating industry.

Industrial coating defects, such as blistering, peeling, and cracking, are symptoms of underlying failures in surface preparation, environmental control, or application, rather than the root cause itself. Effective prevention requires meticulous surface cleaning, monitoring climatic conditions, adhering to technical specifications, and implementing rigorous quality control inspections. AEMCO, authorized distributor for GRACO spray equipment in the kingdom of Saudi Arabia can assist you to do a better job in protective coating. AEMCO can do technical seminars, demonstration with various equipment like :

  • King – GRACO’s pneumatic solution for 1K paints
  • E-King – GRACO’s electric solution for 1K paints
  • XP-hf – GRACO’s pneumatic solution for 2K paints with Fixed Ratio
  • XM – GRACO’s pneumatic solution for 2K paints with Variable Ratio
  • XM-PFP – GRACO’s solution for 2K paints in the passive fire protection industry.

Common Coating Defects & Technical Causes:

Bubble blistering Graco

This is often caused by trapped moisture/solvents or over-application. Always ensure a dry surface and apply within the recoat window.

Caused by poor adhesion to the surface or coating on contaminated surfaces. Proper surface preparation and using compatible systems are essential.

Cracking on a Graco industrial coating spray pattern caused by coating application issues.

Occurs when the coated film is too thick or lacks flexibility. Control your Dry Film Thickness (DFT) according to specifications.

Usually caused by air entrapment between surface and coating film, high viscosity, or missed spots. Thorough mixing, correct viscosity checks, and using a holiday detector during inspection are key.

Run and sagging defect on an industrial coated surface caused by excessive coating application

Caused by over-application or excessive film thickness. Apply using proper technique and recommended thickness by the paint manufcatuer.

Chalking on Graco-coated surface.

Typically triggered by UV exposure and poor resin quality. Solve this by using UV-resistant, high-quality coatings.

Key Prevention Strategies:

  • Surface Preparation: Ensure cleanliness as recommended by the paint manufacturer and proper anchor profile.
  • Environment: Control temperature and humidity, staying at least 3°C above the dew point.
  • Application: Follow TDS, control wet film thickness (WFT), and monitor curing.
  • Inspection: Use holiday detectors and calibrated gauges to identify issues early.
  • Technical Advise : Always seeks professional advice from companies like AEMCO and use their expertise to your success.

It is also a professional practice to refer to standards from AMPP (formerly NACE/SSPC) for more technical insights on corrosion protection and industrial coatings.