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Re: Vinegar to prep metal?
It is one of those old school methods.
My uncle did body work in the 50's and 60's, back when they used lead as filler. Vinegar was a good way to clean the lead surfaces.
It is also a good method to prep galvanized for paint.
But like it has been posted, I'd go with the manufacturer's directions for what is going to be on top of the treated surface.
S
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