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Powder over Liquid Paint

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Q. Can you tell me whether powder coating can be applied to painted components? I want to cover uncoated areas of pieces after electro-galvanneal is sprayed with zinc-rich paint. L.Q.

 

A. Many liquid coatings will not take high temperature. The result is that the liquid coating will bubble under the powder and create defects in the film. So most of the time it is not possible to apply powder over wet paint. Some wash primers with zinc are OK, but many liquid paints will not work under powder. The powder may adhere to a thermally cured liquid also but it is not commonly done. Test a sample to see if the liquid paint and powder will work together.
 

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