06-12-2010, 10:05 PM
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Senior Member
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Join Date: Jul 2004
Location: Manteca, CA
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I'm pretty sure all of the metal prep sprays leave a yellow/light brown residue that can be mistaken for rust....but its really the solution doing its job. They usually leave a phosphate residue whihc is kinda yellow....
Check with the company that makes the metal prep spray you used.
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