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topic 17697

Is Blue Alodine Bad?


I have been acid etching and treating Stearman Biplane parts with Alodine 1201 [linked by editor to product info on Amazon] . Castings and panels have been coming out of the solution a bright to dark blue color. Is the solution bad or is the color due to copper content of the aluminum? (which is world war II vintage and unknown.) Is a blue conversion coating safe to prime?

Luis F. Villar MD
- Stuart, Florida

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