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Oils and other contaminants that remain on the part will show through the powder as dark spots. Eastwood offers a product called "Pre Painting Prep," which effectively removes grease, oils, and other contaminants from the metal's surface. Just spray it on liberally and wipe. Of course, from this step forward you should be wearing latex or nitrile gloves to keep from contaminating the piece with the oils from your skin. View Related Article
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