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Antique Tractor Paint and Bodywork

Sand/Media blasting on tractor sheet metal?

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JCS OH

10-17-2005 07:16:13




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Is the tractor sheet metal likely to be deformed with sand or media blasting? My local body shop says that I will ruin it, but I see some posts where some are sandblasing everything... Is tractor sheet metal thicker than cars?

What is the best way to prep?

Thsnks... J.




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BobinKy

10-17-2005 19:57:20




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 Re: Sand/Media blasting on tractor sheet metal? in reply to JCS OH, 10-17-2005 07:16:13  
I can tell you from my hot rodding days that sand blasting will not deform metal to any appreciable extent if the operator knows what he is doing. There are a number of different materials that your local media stripping operation can use to take paint off. They use walnut shells, sand, silica, and a bunch of other stuff. That having been said, if you blast metal with any media that applied under extreme pressure you will have a very rough surface that will almost assuredly require filler and further body work. If you take the paint off with stripper, a wire cup brush and hand sanding, there will not be the pitting and abrasive surface that is left from sandblasting. I don't know about you, but I really don't relish the idea of having bondo or other surface filler sitting in the weather on my tractor. In addition, sandblasting leaves remnants of the sand in every nook and cranny on the panel. This sand will creep out just as you begin to paint and mess stuff up. I heard an old hot rodder buddy tell of the guy who had his harley blasted and he painted it in his garage. When he took it out for a ride the brakes would not work and he crashed his bike. Turns out the caliper was full of sand and would not operate. I am stripping mine as we speak. Goodluck.

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CNKS

10-19-2005 17:52:43




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 Re: Sand/Media blasting on tractor sheet metal? in reply to BobinKy, 10-17-2005 19:57:20  
The sandblasting I have done and have hired done does not leave a rough surface. On the sheet metal I use surfacer under the topcoat, any minor "pits" are easily covered. I usually sand or wire brush the surface anyway, because I don't consider a sandblasted surface paint ready, it is not clean. It may be ok if some media other than sand is used. I use sand because it is cheap, I do use a supplied air system when blasting as I don't trust the charcoal masks. I use body filler in the dents and any rust pits. It's fine because I probably never exceed 1/16 inch, perhaps an occasional 1/8. Any deeper and it gets JB Weld. The body filler is covered with epoxy primer which is waterproof, as is the topcoat. Thus, getting water into the body filler is next to impossible. I use sandblasting mainly for rust removal, wire brushing or chemical stripping otherwise. If the piece has rust under the paint, it may get sandblasted also if it cannot be easily sanded.

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CNKS

10-17-2005 17:02:48




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 Re: Sand/Media blasting on tractor sheet metal? in reply to JCS OH, 10-17-2005 07:16:13  
It is a lot thicker than that on cars, and you can deform it. The hood on my 460 has a slight peak on top. I completely flattened it with about 100 psi. Had to reshape it, took a lot more time than the sandblasting, also more time than if I had chemically stripped it and hand sanded.



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Billy C.

10-17-2005 15:43:33




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 Re: Sand/Media blasting on tractor sheet metal? in reply to JCS OH, 10-17-2005 07:16:13  
I sandblasted the sheet metal for my '41 John Deere "H" with no ill affects. Of course, I had the metal off the tractor. Only thing that happened was a few pinholes came in it where rust was real bad.



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