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Paint question, what's next?

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IH john

11-11-2002 06:06:21




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I have a 1940 IH pickup that had been in a barn for over 20 years. I am restoring the truck and am now ready to work on the cab. I have three different options on how to proceed and I thought I would ask this board as they have had very good insight on prior posts. All the paint was gone and the body was completely covered with a light covering of rust. I painted the entire cab, inside and out with phosphoric acid. That has turned the metal a dark black color and is the texture of 80 grit sand paper. The options are; 1. paint it with a primer / filler material and sand that out. 2. Sand the black covering off and then primer and paint. 3. Have the body media blasted and then paint. What's the board think?

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CNKS

11-11-2002 18:21:11




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 Re: Paint question, what's next? in reply to IH john, 11-11-2002 06:06:21  
You can do what Todd says, but you are going to have to retreat with phosphoric acid because the blasting will expose bare metal.



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Jerry B

11-12-2002 08:03:13




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 Re: Re: Paint question, what's next? in reply to CNKS, 11-11-2002 18:21:11  
No reason to repeat the acid treatment. The acid is used to convert the rust to a "primer" type of surface.

Media blasting would remove the oxide coating, but not touch the rust. The only way to QUICKLY remove the rust is to have the entire cab derusted using an electrical process.

Lacking that, it is time to stock up on 6 inch 80 Grit DA paper and a good aggressive DA sander. Make sure your air compressor is tuned up and ready to work hard for a few days.

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CNKS

11-12-2002 18:42:36




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 Re: Re: Re: Paint question, what's next? in reply to Jerry B, 11-12-2002 08:03:13  
Based on my limited knowledge of this subject -- He will sand down to bare metal, which will take a while. The sanded areas will begin to rust. Therefore he needs to treat the bare metal with some agent containing phosphoric acid, be it metalprep, which has to be washed off and painted immediately, or a product such as Rass O Nil, which can be painted over without further treatment as long as it is not exposed to moisture.

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Jerry B

11-13-2002 06:59:46




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 Re: Re: Re: Re: Paint question, what's next? in reply to CNKS, 11-12-2002 18:42:36  
I understand your concern, but if humidity and the consequential rusting is a problem then you (he) should not sand down the entire truck at once.

Pick a panel and begin with it. Sand it down until all rust is removed the best you can. Prime with a self-etching primer to seal the metal from the air. Don't worry about over spray falling on other metal, it is going to be sanded shortly anyway.

Work one panel at a time and rust will not be a problem.

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Todd in IL

11-11-2002 13:32:18




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 Re: Paint question, what's next? in reply to IH john, 11-11-2002 06:06:21  
I would media blast it, then bring it back up with 2k. (Dupont's urethane primer) fill any small dents and block and reprime until finshed.



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Todd in IL

11-11-2002 13:29:18




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 Re: Paint question, what's next? in reply to IH john, 11-11-2002 06:06:21  
I would media blast it, then bring it back up with 2k. (Dupont's urethane primer) fill any small dents and block and reprime until finshed.



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