Re: Vinegar to prep metal?
It's sold at Home Depot (and other hardware stores) as a concrete etch, to be used before applying epoxy floor coatings. So, another option would be to find a local epoxy flooring installer in your area. You could ask him if he etches with phosphoric acid, then ask him if you can buy a gallon from him.
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'59 Apache - 383" SBC/TH-350
'68 GMC - BBC/TH400
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