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Paint Degradation - Blistering
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Blistering symptom caused by the moisture trapped inside the paint film being expanded by heat, lifting the paint film.
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CAUSES:
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Paint applied without removing oil/grease, silicone, wax, sweat, finger print, etc. from the surface being painted. | |
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Sanding dust remained on surface being painted due to poor washing after wet sanding. | |
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Oil or moisture being mixed in the compressed air supply for the paint gun. | |
PREVENTION:
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Avoid natural drying after wet sanding. Force dry instead. Pay extra attention when sanding body filler. | |
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Check air compressor and pressure regulator oil and water. Install and maintain oil and water separators on the air line. | |
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Do not touch the area being painted before paint application. | |
CORRECTIVE ACTIONS:
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If the symptom is severe, strip the base coat or all the way down to the metal surface and repaint. | |
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If the symptom is light, remove the blisters by sanding, then repaint. | | | | 
