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topic 60552

Clearcoated bronze plate gets black spots

November 6, 2017

Q. Black spotting on .25" thick bronze plate, it shows up on polished surfaces. it almost appears to be staining. we oxidize the machined surfaces, stroke sand raised areas. Multiple washes and pre-treating. The staining appears long after clear coat is applied. it leaves facility clean and clear. It is very random, cannot come up with a solution or 2 commonalities. Very frustrated, I do know the staining is between the clear-coat and polished surface.

chuck clemmons
- Danville, Illinois

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