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Common Problems & How to Avoid Them
Common Powder Coating Problems & Solutions
While powder coating is one of the most reliable and durable finishing methods available, the quality of the final result depends heavily on the preparation, application and curing process. Even small errors can lead to visible imperfections or reduced coating performance.
Understanding the most common powder coating problems — and how to prevent them — helps ensure every project achieves a flawless, long-lasting finish.
Poor Adhesion
Problem: The coating doesn’t stick properly to the metal, leading to flaking, peeling or bubbling.
Cause: In almost all cases, poor adhesion comes down to inadequate surface preparation. Oils, dust, rust or previous coatings left on the substrate can prevent the powder from bonding effectively.
Solution: Proper cleaning and degreasing are essential. Professional powder coating companies use chemical pre-treatments, shot blasting or phosphate coatings to create a clean surface with the right level of adhesion.
Orange Peel Effect
Problem: The surface appears uneven or slightly textured, resembling the skin of an orange.
Cause: This issue is often caused by incorrect curing temperature or powder thickness. It can also occur if the coating powder is applied too heavily or inconsistently.
Solution: Ensure correct curing times and temperatures are maintained, and that the powder is applied evenly using calibrated spray equipment. Regular oven testing and controlled air pressure during application prevent this defect.
Pinholes or Bubbling
Problem: Small bubbles or pinholes appear on the surface of the coating, often noticeable after curing.
Cause: Moisture or contamination trapped beneath the powder layer. This can result from high humidity, incomplete cleaning or residual gases escaping from the substrate during heating.
Solution: Always dry and pre-bake items before coating if necessary. Using clean, dry compressed air and keeping powder storage areas moisture-free helps eliminate this issue.
Uneven Colour or Gloss
Problem: Colour variations, dull patches or inconsistent gloss levels across the coated surface.
Cause: Uneven application, improper grounding, or mixing different powder batches without proper blending.
Solution: Apply coatings in a controlled environment, using high-quality powders from a single batch where possible. Reputable suppliers conduct visual and thickness inspections to ensure a consistent, even finish.
Curing Issues
Problem: The coating appears soft, dull or brittle, or chips easily after curing.
Cause: Over-curing or under-curing caused by inaccurate oven temperatures or uneven heat distribution.
Solution: Regularly calibrate ovens and monitor cure times carefully. Consistent, even heating ensures the powder fully melts and cross-links to create a strong, resilient surface.
Preventing Powder Coating Problems
The best way to avoid these issues is to work with a qualified, experienced powder coating specialist. Professionals follow strict quality control procedures — from pre-treatment and powder storage to oven calibration and final inspection.
Regular maintenance and inspection of coated products can also help detect early signs of wear or damage, allowing for timely repairs before major issues occur.
Professional Quality, Every Time
By understanding the common powder coating issues and their causes, you can better appreciate the skill and precision required to achieve a perfect finish. When carried out correctly, powder coating provides decades of protection and performance — proving why it remains the trusted choice for manufacturers, engineers and fabricators across the UK.
