Mark, I have two tractors that had their sheet metal prepped and painted by pro body guys with their own shops. Both took the pieces down to bare metal with DAs, then primed and painted. Both tractors looked good for about four years, then the paint on both started to bubble at places where there had been little pits in the metal, where the paint had worn a way first, like right in front of the five speed shifter on my 960. Soon after I was sandblasting and painting the body on my dump truck myself. The counter guy at the paint jobber told me that I needed acid wash. Looking into it I found out that little bits of rust will be left down in the rust pits in flat steel or cast iron, and even with epoxy or etching primer, they will slowly enlarge until they bubble up. Phosphoric acid converts rust to iron phosphate which is a strong, inert black film. The product instructions tell you to keep the surface wet with the product for ten minutes, then wash it off, I do this by tossing small parts in a bucket of water and spraying larger parts with a hose stream. A little brushing is good too. After it dries if there is any of that "white residue" another acid application will dissolve it, followed by a little better rinse. The rinse is followed by wiping with the final prep product. If you plan to sell within three years, or you can check pits and depressions in cast iron microscopically for remaining rust and there is none, then you can skip the acid wash. I will never skip it again though, on anything with rust on it.
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