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Primer for tractor


 
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Mo in NE tex
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PostPosted: Wed Jul 11, 2018 7:25 am    Post subject: Primer for tractor Reply to specific post Reply with quote

About got my tractor cleaned off, used a caustic soda mixture to remove all old paint and cleaned good with soap and pressure washer, rinsed of several times and applied phosphoric acid to entire tractor. Should I use a self-etching primer or an epoxy next? If so, how long can I wait to paint base coat. I want to try to drive the tractor a few days to make sure I have all leaks fixed before final paint. Plan to paint with good paint, then a clear top coat. Any advise is appreciated.
 
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showcrop
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PostPosted: Wed Jul 11, 2018 4:49 pm    Post subject: Re: Primer for tractor Reply to specific post Reply with quote


Sounds like you are doing all the right things so far. You want to use epoxy primer and download the instructions from the paint mfg. web site.
 
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Stephen Newell
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PostPosted: Wed Jul 11, 2018 6:24 pm    Post subject: Re: Primer for tractor Reply to specific post Reply with quote

Sodium Hydroxide is a salt which can get into the metal and between parts bolted together. It will dry there and when the weather is wet it will re-active and promote rust. I'm not sure if the phosphoric acid will neutralize it or not. I've always been told to use vinegar to neutralize it. Then a more than normal rinse to get rid of either substance.
 
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showcrop
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PostPosted: Thu Jul 12, 2018 4:14 am    Post subject: Re: Primer for tractor Reply to specific post Reply with quote


Sodium Hydroxide is actually a caustic, or base (google it) which is the opposite of an acid. The phosphoric acid which you followed it with, provided you used enough and allowed adequate contact time, does an excellent job of neutralizing any residual alkali. The NaOh, since you were using it to break down dirt, grease, and paint should not have penetrated deeply, since it was blocked by the dirt grease and paint. The phosphoric acid should have done a complete job of neutralization. Another benefit of the phosphoric acid is that it converts any residual rust to inert iron phosphate which serves as additional protective coating. All of this is part of why I told you that you are doing all the right things.
 
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Mo in NE tex
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PostPosted: Fri Jul 13, 2018 1:52 pm    Post subject: Re: Primer for tractor Reply to specific post Reply with quote

Thanks for the advice fellows, I have a long way to go before final paint. I never knew there were so many small parts to clean and paint. Then all the bolts and nuts and washers too. Is there an easy way to mass paint the small parts (nuts/bolts/washers) other than punching holes in card-board and then shoot them? Can I put everything together an then shoot the whole tractor?
 
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showcrop
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PostPosted: Fri Jul 13, 2018 5:39 pm    Post subject: Re: Primer for tractor Reply to specific post Reply with quote

CVPost-Mo in NE Tex wrote:
(quoted from post at 14:52:06 07/13/1Cool Thanks for the advice fellows, I have a long way to go before final paint. I never knew there were so many small parts to clean and paint. Then all the bolts and nuts and washers too. Is there an easy way to mass paint the small parts (nuts/bolts/washers) other than punching holes in card-board and then shoot them? Can I put everything together an then shoot the whole tractor?


You certainly can put everything together and then shoot. The back of the starter on any tractor, along with the portion of the block behind it, will have very little paint on it if it has never been repainted, because the starter blocks the spray. If this is Ok with you well then do it.
 
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miner09
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PostPosted: Fri Jul 13, 2018 7:11 pm    Post subject: Re: Primer for tractor Reply to specific post Reply with quote

Mo where are you located? I'm in Lamar County.
 
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Mo in NE tex
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PostPosted: Sat Jul 14, 2018 5:43 pm    Post subject: Re: Primer for tractor Reply to specific post Reply with quote

Hunt Co, Greenville area.
 
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Ken Combs
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PostPosted: Sat Jul 14, 2018 7:00 pm    Post subject: Re: Primer for tractor Reply to specific post Reply with quote

I agree on the Epoxy. But, be sure to check the brand/formula as some epoxies contain an acid and are not to be used over an acid pretreatment. Southern Polyurethane is one such brand. I use Kirker as it's cheap and has no acid in it.
 
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Scout2008
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PostPosted: Mon Jul 16, 2018 8:24 am    Post subject: Re: Primer for tractor Reply to specific post Reply with quote

I?m in the process of doing one right now. For bolts I do the punching holes in cardboard trick. I used to put nuts and washers on a wire line to shoot them, but it?s too hard to get good coverage. On this one I put all of the nuts and washers flat on cardboard. I primed one side, let it dry and flipped them, then primed and painted the other side. My thinking is that side that is only primed will be the down side upon installation. Hopefully it works out that way!
 
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