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Antique Tractor Paint and Bodywork

Primer questions

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FARMIN RED

07-06-2004 06:31:07




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I am working on a tractor and here is my situation. I only get to work on the tractor maybe an hour or two per week. I am working on the body work. I need to use a primer that I am able to shoot on and maybe let it sit for a week or two before I get back to it to sand it. Some one tell me what is wrog with a urathatne primer. All I hear you guys talk about is the epoxy primers. I know that there are other primers out there. I am not going to use this tractor for farm use at all. This tractor is going to be a show, paraide, and tractor ride tractor only. Some one please help.

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CNKS

07-06-2004 17:59:49




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 Re: Primer questions in reply to FARMIN RED, 07-06-2004 06:31:07  
We talk about it because it is superior to any other primer, with the possible exception of etch primer, which I know nothing about. Epoxy primer bonds to the metal better than urethane surfacers. There is also less prep work. Some urethane primers require bare metal to be sanded AND etch primed before applying, and it still may not stick as good as epoxy. Epoxy will also seal and waterproof old paint if you are painting over a sound old surface, urethane won't. Apply the urethane over the epoxy on the sheet metal, and sand it smooth. You do not need a urethane surfacer on cast, just epoxy. There are no disadvantages to epoxy that I know of. The catalyst does not contain iso's, at least PPG's doesn't. Don't even consider not using a primer. Modern paints were not designed to be used on bare metal, that includes IH 2150, which is a form of acrylic enamel. It may look good for a while, but eventually it will peel off.

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CNKS

07-06-2004 18:10:02




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 Re: Re: Primer questions in reply to CNKS, 07-06-2004 17:59:49  
I didn't answer all your question. If you use Epoxy and don't topcoat within the recommended window, it must be scuffed and reapplied. I don't use epoxy right away, but apply a "protectant" such as Picklex 20 and let it sit. It won't rust as long as it is kept inside. So, my system is clean to bare metal, apply Picklex 20, allow to sit sometimes for 4-5 months, apply epoxy and surfacer if desired, then topcoat. I do usually apply the Picklex a second time, just to make sure I get any rust that may have escaped the first treatment, probably not necessary.

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Steve W (NY)

07-06-2004 06:36:05




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 Re: Primer questions in reply to FARMIN RED, 07-06-2004 06:31:07  
I don't use primer! I use IH 2150, and clean the metal bare, and just shoot it. I am prety sure that none of the companies used primer, and I've had pretty good luck without it. The only tractor I primered drives me nuts. Every time it gets a scratch, you see the primer color.

Take Care
Steve



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FARMIN RED

07-06-2004 06:40:17




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 Re: Re: Primer questions in reply to Steve W (NY), 07-06-2004 06:36:05  
I am not gong to use 2150 paint. I am going to use a different companies paint. The thing with not putting primer on the tractor is if you do get a scratch you will have bare metal showing and that spot may rust earlier than the painted surface. I also want to use the primer as a type of filler to fill the cast pieces to make thwm look smoother.



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CNKS

07-06-2004 18:16:01




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 Re: Re: Re: Primer questions in reply to FARMIN RED, 07-06-2004 06:40:17  
There is a lot of work involved if you want smooth cast. I have heard of tractors done like that and while they look good, IMO they are artificial. I do sometimes repair obvious flaws that occurred in the casting process, but they have to be pretty bad. Cast is naturally rough, and looks fine once painted, as far as I'm concerned.



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