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Locating aluminum sheet defects before anodizing

How to find a defect on anodized aluminum sheet before coating. We have a lot of problems which appear after coating.

Bibish Zaidi
r/d chemist - Karachi, Sindh, Pakistan
2004

I'm not sure which "defects" you are referring too, but usually metallurgical defects will be visible after caustic etch, and desmut, just prior to anodizing. Unfortunately anodizing tends to highlight any surface scratches, or material defects.

Marc Green
anodizer - Boise, Idaho
2004

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