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John Deere Tractors Discussion Forum
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how to fix rust pits in hood?

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BB

02-20-2004 19:17:22




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My JD A has about four rust pitts in the hood, a couple of them is about the size of the end of a finger. I would rather not have to buy a used hood. What would be the best way to fix the rust pits in the hood where it would look decent. I am not a person who is going to take it to shows, but I am going to paint the tractor. Comments?

BB




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John

02-22-2004 04:16:41




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 Re: how to fix rust pits in hood? in reply to BB, 02-20-2004 19:17:22  
Sandblasting is fine for heavy metal. But in order to get al the rust out of sheet metal you have to blast your way below the lowest rust pit. That makes heat and distorts the metal. I favor loose rust removal and then the "chemical cure" to kill the rest. Corrosion is a chemical process itself and it seems logical to fight it the same way.



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jb

02-21-2004 17:19:08




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 Re: how to fix rust pits in hood? in reply to BB, 02-20-2004 19:17:22  
Here is what I've done. Sandblast the hood. Go to NAPA and get gray lacquer primer paint. Use an airless paint sprayer to paint, and lay it on thick. This paint sands very easily. Sand it down until you see some bare metal, then paint agian. It may take several coats to get a smooth surface. This should work if these are only rust pits and not dents, but this will work on small dents as well. This way you can stay away from bondo.

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MDM

02-21-2004 11:24:32




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 Re: how to fix rust pits in hood? in reply to BB, 02-20-2004 19:17:22  
BB, you can cut away the rusted out place far enough back to get good metal, and then fabricate a patch (out of similar thickness metal) the same size as what you cut out. then just weld into place. weld small beads at a time so metal does not get too hot and warp. then just grind down smooth and touch up with bondo as needed to get the quality finish you are looking for. sounds difficult, but really is quite simple.

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John

02-21-2004 03:52:56




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 Re: how to fix rust pits in hood? in reply to BB, 02-20-2004 19:17:22  
The advice on the previous post is pretty much the way its done. Only thing I would respectfuly add is that after sanding and before paint is treatment with a quality zinc phosphate primer. This "nuetralizes the rust" with a chemical process so it doesnt reappear. There are other ways that mite be easier and more effective. In the archives look for posts by F.I.T. Or post a question to him on this board. He has done extensive homegrown research and developement on rust elimination that the average guy can use effectivly. Damn near a legend in his own time.

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Marty Z

02-20-2004 21:52:38




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 Re: how to fix rust pits in hood? in reply to BB, 02-20-2004 19:17:22  
It is just like doing a car fender. Go to K mart and check out the Bondo section. I have had good luck with the fiberglass short strand Bondo for the first coat and then regular bondo for second coat then finish any flaws with the glazing putty. Prime and paint. Make sure you have a good clean surface to start with and sand away almost every thing that you put on. A D/A sander helps but it can be done by hand for small jobs like your's ..You will see good results with not much experience. I did..
Marty Z

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