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Farmall & IHC Tractors Discussion Forum
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Primer?

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iester

03-13-2005 18:25:35




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Should all bare metal parts recieve primer,If so what color? {Ih tractor}




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CNKS

03-14-2005 18:31:20




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 Re: Primer? in reply to iester, 03-13-2005 18:25:35  
The best primer, in my opinion, and what I use, is catalyzed epoxy on a properly prepared surface (the catalysts used in most epoxys do not contain isocyanates) It can be directly topcoated on the cast, or you can use a surfacer over it if you want to smooth out the finish on the sheet metal. It does have a window of 2-3 days to a week that you must paint over it, or else you have to scuff and reapply. It can also be used as a sealer over properly prepared old paint. Etch primer is ok, but as noted you cannot directly topcoat it. Etch was really designed for new bare metal fenders, etc, in automotive applications, for production type body shops that do not want to take the time to sand, or to use some metal prep product. Done right, on tractors, you have already wire brushed or sanded the old paint off, so etch primer is really not needed. But, either is FAR superior to the lacquer or red oxide type primers, as these will not stick to the metal as well.

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TDK

03-14-2005 19:20:32




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 CNKS ? in reply to CNKS, 03-14-2005 18:31:20  
I want to make sure I understand you correctly, as I've never used the epoxy primer. I am about to paint a C and a 300U and I'm going to use it on both. After the 3 day window I have to scuff & recoat with more epoxy ? Why can't it be scuffed and just painted ? Also, after coating with epoxy I will spray red oxide on sheetmetal to finish sand before painting. How long must I wait between epoxy and the red oxide ? Thanks, have been looking forward to using the epoxy since you highly recommend it.

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CNKS

03-15-2005 07:36:21




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 Re: CNKS ? in reply to TDK, 03-14-2005 19:20:32  
The link is in more or less alphabetical order, scroll about 3/4 of the way down until you see "MP 170 Epoxy Primer" it will tell you all you need to know. I don't know why you can't scuff and paint, I haven't tried it. I always try to follow the instructions as PPG knows far more than I do. Use PPG's MP 181 surfacer on top of the 170, not the "red oxide" stuff. IF and only if you have a supplied air system you can use MP182, it requires hardener. I believe both 181 and 182 are gray. Some people don't like that because chips and scratches show more. I like gray, because you can see the places you missed and tough them up (within the allowed time). 170 is gray also. Print out all the spec sheets for the products you are using, I have mine taped to the wall where I mix the paint.

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Gordon

03-14-2005 05:24:21




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 Re: Primer? in reply to iester, 03-13-2005 18:25:35  
Largr bare metal surfaces should get a coat of etching primer. Followed within 48 hours with red oxide primer. Non sanding with hardener for the cast pieces, and standard primer-sufacer and block sanding for the tin til it is dent free. Paint can never "hide" anything!

GordoSD



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Jeff In Ontario

03-13-2005 19:47:23




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 Re: Primer? in reply to iester, 03-13-2005 18:25:35  
I've always been told that Red Oxide primer is the best to use on tractors etc.. that 's what i've been using on all of my stuff and it works great. Not sure of the pro's/con's sorry, just know what my experience has been.
Jeff



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David B

03-13-2005 18:33:32




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 Re: Primer? in reply to iester, 03-13-2005 18:25:35  
They were painted at the factory with no primer, but I like to prime 'em anyway. I'd use gray, but it doesn't make a big difference unless it gets scratched and the primer then shows.



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iester

03-13-2005 19:31:27




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 Re: Primer? in reply to David B, 03-13-2005 18:33:32  
Do i need primer? What advantage? sounds like paint over paint. I though that was wrong? Help..... please



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CNKS

03-14-2005 18:50:39




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 Re: Primer? in reply to iester, 03-13-2005 19:31:27  
Primer, particularly etch or epoxy bonds to the surface, the topcoat bonds to it. Modern paints will peel off after a period of time if there is not primer under them. It's paint over paint, but the primers and paints are designed for different applications. If you want a good, durable job, use primer, if you want to unload it on some sucker, just wash it and spray with the cheapest paint you can find. I have bought a couple of tractors like that, with the intention of stripping them and starting over, which I did. Briefly, on the cast epoxy followed by topcoat, on the sheet metal and anything else you want smooth, epoxy followed by sandable surfacer, followed by topcoat. The surfacer is sanded between coats until smooth.

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