Brandon, You question is one that is fairly hotly contested on this forum. I have had tractor body panels that I have had pros paint for me that after 3-6 years I can see little rust bubbles forming in places where there would have been pits prior to the refinishing. Just prior to the appearance of these bubbles on these panels, I was sandblasting and painting a dump truck body. When picking up the paint the counter man told me that I also needed acid wash. I had not heard of it so he explained how after you take the metal down to bare metal, there will always be some rust left at the bottom of the pits, so you need to "wash" with the acid prior to priming, if you don't want your new paint to bubble. He also advised wiping the surface down after the acid wash with a liberal application of a final prep product to remove moisture to prevent flash rust. There are a lot of phosphoric acid products on the market for converting rust to black iron oxide which is inert and is actually a barrier protective coating on steel and cast iron. The liberal final prep application also removes excess phosphoric acid residue. If the wipe down is inadequate, upon drying a little white residue will be left This residue can be removed with a little brushing, as with a plastic bristle scrub brush. The acid wash is even more important on cast iron than steel due to the pores in cast iron which will easily harbor rust molecules. CNKS will soon post his rebuttal, that epoxy primer will penetrate to the bottom of pits and pores, just as well as the acid will chemically "eat" it's way to the bottom.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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