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Antique Tractor Paint and Bodywork

Done with sandblasting-Now what

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180doug

12-24-2007 01:46:26




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When you are done sandblasting ,I was gonna use a wax + grease remover ;easy to do on sheet metal ,what about on the hard to get to places ? Is there a spray on application? Am I on the right track?




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Mike M

12-29-2007 05:47:02




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 Re: Done with sandblasting-Now what in reply to 180doug, 12-24-2007 01:46:26  
Lots of different ways listed.

I have NEVER had any trouble by just blowing off the dust using air ran through a water trap and then if you want to use primer spray it on but really primer doesn't seem to make much differance you can just spray on the paint just like the factory did. The sooner the better,but I have had blasted parts last a long time in my heated shop that I also run a dehumidifier in to keep the moisture down when needed.

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CNKS

12-29-2007 09:10:23




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 Re: Done with sandblasting-Now what in reply to Mike M, 12-29-2007 05:47:02  
If you are using the old alkyd enamels that were used on the older tractors, you are correct in that primer was not usually used. It is necessary for acrylic enamel and the urethanes. Problem with not using it, even with alkyd, is that when you get a paint chip, or if the paint is not "stuck" very well, you get rust in that area which will work under the remaining paint. Epoxy primer has excellent adhesion properties both to the metal and topcoat, and is water proof. In addition to giving better adhesion to the topcoat, minor chips will usually only go to the primer, meaning no rust. But, I will agree that if you use alkyd and keep the tractor inside, you may never know the difference. But, I have a Farmall M, painted shortly before I bought it, that apparantly was stripped to bare metal and repainted without primer. The alkyd simply wore off (not abused), thus there is now rust, in addition to severely faded paint due to it being outside.

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Ford Red

12-28-2007 16:09:44




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 Re: Done with sandblasting-Now what in reply to 180doug, 12-24-2007 01:46:26  
The metal is only as clean as the sand it was blasted with, what the parts have been set down on, and the oils form the hands or gloves used to handle the parts. And, blasting with clean media doesn"t necessarily remove everything that was on the parts to start with. Unless you know the parts are hospital clean, wash them down with solvent, then prime them before they start rusting.



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glennster

12-24-2007 05:39:31




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 Re: Done with sandblasting-Now what in reply to 180doug, 12-24-2007 01:46:26  
put the wax and grease remover in your primer gun and use that to spray it on, then scrub the best you can with a scotchbrite pad, follow with a clean cloth.



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CNKS

12-24-2007 05:17:49




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 Re: Done with sandblasting-Now what in reply to 180doug, 12-24-2007 01:46:26  
I sand the sand blasted parts with 180, use wax and grease remover, then do the bodywork, then use epoxy primer. You have taken a dirty part, run dirty sand on it, and handled it, therefore you ALWAYS use wax and grease remover before painting anything, even if it only has fingerprints. The blasted surface is not really clean until the W&G remover is used. I also like the sanded texture better than the blasted one, as it is somewhat smoother. You are going to use surfacer over the epoxy to fill the sand scratches anyway. I use wax and grease remover out of a squirt bottle, will penetrate the hard to get to places, then wipe it out as best you can. Don't try to prime a wet surface.

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PaulW_NJ

12-24-2007 04:59:09




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 Re: Done with sandblasting-Now what in reply to 180doug, 12-24-2007 01:46:26  
If you've sandblasted, and done a good job of it, there's no reason to apply wax and grease remover . . . sandblasting does that. You either need to prime it (recommend epoxy primer) before it begins developing flash rust (which will begin almost immediately), or treat the surface with Picklex20. That will hold off any rust, till you can prime it, as long as you don't let it get wet. There is another product that appears to be as good called Must for Rust, available at Home Depot. They are both phosphoric acid with some sort of resin that holds it on till it dries. Get one of the other on there quick!

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