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Mill scale must be removed prior to painting because any breach in the mill scale will cause moisture to get beneath it, causing it to flake off. If there is paint on top of it, and moisture gets below the paint and the scale, both will peel and flake off because the paint is adhering to the mill scale, not the underlying metal surface.

Paint should always be applied only over a clean, sound surface.

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Q: Why is it considered essential to removed millscale pior to painting?
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