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How to Fix Powder Coating Blistering on Metal Parts
Blisters or bubbles on powder coated metal parts often appear after curing. It is related to substrate moisture and pre-treatment.
H2: Blistering Main Triggers
• Water trapped inside metal casting or welded seams
• Residual chemical from pre-treatment tanks
• Rapid heating in curing oven
• H2: Troubleshooting Checklist
1. Dry cast or welded parts fully before powder spraying
2. Improve rinsing process after chemical pre-treatment
3. Apply slow pre-heating before high-temperature curing
H2: Field Case
A pump component manufacturer eliminated coating blisters after pre-treatment upgrade.
FAQ
Q: Will rust under coating cause blisters?A: Yes, residual rust under coating can create bubbles over time.Check our pre-treatment tanks design for powder coating turnkey lines.
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