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Antique Tractor Paint and Bodywork

Re: Omni acid etch proper use/prep before hand

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showcrop

12-14-2012 07:44:49
75.67.231.80



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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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CNKS

12-14-2012 11:41:54
216.144.104.128



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 Re: Omni acid etch proper use/prep before hand in reply to showcrop, 12-14-2012 07:44:49  
Showcrop, I use Picklex 20 or Must For Rust on pits on sheet metal. There is no good, safe way to get it out of the pores on cast. I did not say that epoxy will penetrate to the bottom of pores, it won't. I imagine that if there is rust activity in those pores that epoxy will at least slow the rust down. It is a good sealant, whether or not it will prevent rust from coming to the surface I don't know, as I have never seen rust lift anything on cast on my tractors. Rust is not my problem, it may be yours and others that live in humid climates, especially in salt air as you do. If anyone actually knows how to safely seal or remove rust from pores in cast I would like to know it. And, one person posted on this forum a few years back that claimed that etch lifted the paint on his tractor about a year later, true or not I don't know. I just don't think it's a good idea.

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