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Antique Tractor Paint and Bodywork

Why does my new paint chip so easy

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awc

11-16-2006 03:29:29




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I painted my tractor with ppg paint and used ppg reducer and hardner in the correct amounts. The metal was prepared by sandblasting to clean metal,and then I used ppg metal cleaner, ppg metal conditoner, and ppg primer. The paint looks beautiful but seems very brittle. The slightest bump with a wrench causes a chip. I thought that for the price of the products I used, the paint should be a little more durable than it is. Some chips go to the primer and some go to the bare metal. What did I do wrong, or is this just the nature of the beast?

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Dale L

11-16-2006 18:01:27




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 Re: Why does my new paint chip so easy in reply to awc , 11-16-2006 03:29:29  
I painted a Farmall H with omni paint a year or so ago and had the same problem. I think the next time I'll ue a little less hardener. I think that's the way it is. Another lesson learned was I didn't let the paint completely dry[cure] before I started it and fuel dripped from the fuel bowl onto the new paint. You can guess the outcome.



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CNKS

11-16-2006 08:21:36




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 Re: Why does my new paint chip so easy in reply to awc , 11-16-2006 03:29:29  
If you want to avoid chips, you have to treat your tractor like you would a car. I doubt if you would set a wrench on a painted surface of your car or truck. Anything will chip. If you used Omni acrylic urethane, it might be somewhat more susceptible to chipping than the high dollar stuff -- this has been discussed before. Best to be careful.



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B-maniac

11-16-2006 17:26:39




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 Re: Why does my new paint chip so easy in reply to CNKS, 11-16-2006 08:21:36  
PPG makes several "types" of paint.Some are more durable than others. If you used epoxy for the first prime over bare metal, and it chips through that, then you must have hit it pretty darn hard. The chips that go just to the primer are usually because you used a mechanical bond (sand scratches)instead of a chemical bond (sealed with another coat of epoxy) to bind your top-coat to the primer. But like CNKS said,hit your car the same way and see what it does! It's not porcelain! While installing a hood hinge on a '52 Chevy pickup that I restored,the strap portion swung loose and fell down 8" onto the top of the fender and barely left a mark. So minute , the customer couldn't even find it until we showed him. PPG also makes "economy" products. Which did you use? What exactly were the steps in your prep?

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Kent In KC

11-16-2006 07:26:24




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 Re: Why does my new paint chip so easy in reply to awc , 11-16-2006 03:29:29  
I will be refreshing my old POwerMaster next spring. Have you guys ever painted a tractor with epoxy or polyurethane? Seems like that would be pretty rugged.



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Rod (NH)

11-18-2006 18:28:59




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 Re: Why does my new paint chip so easy in reply to Kent In KC, 11-16-2006 07:26:24  
Hi Kent,

What B--- said. In addition, I'll add that you probably do not want to use an epoxy for a color coat. I'm a big fan of epoxy for primer but not for the color topcoat. Epoxies are rugged and will stand up well but they lack UV protection and have a reputation for chalking in sunlight. I painted an aluminum rowboat with epoxy color some 40 years ago (by brush, not spray) and can testify to the chalking and loss of gloss problem. It's still in good shape otherwise however, even after all this time. I've also had an epoxy primer (PPG's older DP) on a sandblasted Honda cowling, exposed to the weather continuously, with no topcoat for 8-10 years. Similar problem but still no rust. Great protection but not the best appearance. You can find some info on epoxies here.

third party image Rod

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B-maniac

11-18-2006 13:10:30




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 Re: Why does my new paint chip so easy in reply to Kent In KC, 11-16-2006 07:26:24  
Kent; I have used PPG's true polyurethane clear on my classic car.Pretty tuff stuff it is.Very expensive and not too "user friendly". Most of the "industrial" stuff like epoxy and polyurethanes are not very easy to spray and dry real slow so runs and insects and dirt etc are a big issue. Also at issue here is the shine or surface texture you want. Most industrial coatings are for protection from harsh environmemts and therefore produce a really textured/orange-peel surface. Looks good from 50' but not too hot up close. They all use isocyanates in their catylists too. I knew from the beginning that I was going to wet-sand (1500 grit) my GTO after it cured in order to get it perfectly "show quallity" flat and so the issues of a true polyurethane didn't matter. Be-ware,it's the hardest sanding and buffing paint I have ever used!!! I use PPG DC 3000 clear on tractors.

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Mike M

11-16-2006 05:50:50




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 Re: Why does my new paint chip so easy in reply to awc , 11-16-2006 03:29:29  
That's one of the reasons I don't like to use hardener ! Another is the increased health risks.



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RustyFarmall

11-16-2006 09:03:30




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 Re: Why does my new paint chip so easy in reply to Mike M, 11-16-2006 05:50:50  
Amen!!! Much easier to just fill in a scratch now and then.



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jason(ma)

11-16-2006 04:21:23




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 Re: Why does my new paint chip so easy in reply to awc , 11-16-2006 03:29:29  
no that is not normal. What specific products did you use? How long between primer and topcoat?



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