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Re: Vinegar to prep metal?
Any treatment that involves acid or water as a followup is likely to contribute to rust or coatings failure.
I say this because I've never seen in a technical data sheet (I've read many in the coatings profession) where acid or water is recommended or mentioned.
What I have seen repeatedly is clean, bare steel coated with epoxy primer, then top coated. Absolutely no mention of acid or water...
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