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Antique Tractor Paint and Bodywork

Color sanding

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hvw

11-28-2006 15:11:35




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I've always read that you should sand in straight lines only when color sanding. I don't seem to be very good at that. What problems would sanding in a circular motion cause? I have a whole car to do and I'd rather do it in a circlular motion but I'll wait to hear from you folks. Thanks for any advice.




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glennster

11-29-2006 06:20:18




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 Re: Color sanding in reply to hvw, 11-28-2006 15:11:35  
we color sand in reasonably straight lines, it just seems easier. one thing to keep in mind when color sanding, is use the palm of your hand to hold the paper, dont use your finger tips. finger sanding puts ridges in the clear and you will see waves after its buffed. use plenty of soapy water, (use car wash soap) sand up to any body lines, dont sand over them, you will cut quickly thru the clear that way, also buff up to body lines, not over them. you can also use a rubber sanding block (see your paint jobber they have all kinds) use 1500 or 2000 grit. its easier to buff the sand scratches out. i use a squeegee to wipe off where i sand to be sure i got all, you want the surface to have an even haze with no shiny spots when you sand.

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CNKS

11-28-2006 17:24:31




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 Re: Color sanding in reply to hvw, 11-28-2006 15:11:35  
If you get the buffing/color sanding video from Eastwood, I think the guy recommends a circular pattern that goes in the same direction as the buffer. My personal opinion is that it doesn't make a whole lot of difference unless you are sanding a Mercedes or Rolls Royce. All I have done is tractor hoods and fenders -- I don't see any sanding marks.



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hvw

11-28-2006 17:40:39




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 Re: Color sanding in reply to CNKS, 11-28-2006 17:24:31  
Thanks CNKS. It just seems easier for me to sand in a circular motion than in a straight line. And I guess I couldn't really see what difference it would make. Particularly since the buffer moves in a circular pattern. I figured I'd better ask you guys.

This is not a show car by any stretch. It's a daily driver. I think pecan sap or acid rain or something got on the clear coat before it cured. It developed little pits on all surfaces that face upwards, like the hood, trunk, etc. Color sanding and buffing seems to remove them. But sanding in a straight line is apparently beyond by capability.

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B-maniac

11-29-2006 17:43:19




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 Re: Color sanding in reply to hvw, 11-28-2006 17:40:39  
You sand in straight line so at the end of each stroke the paper will clear itself of debris and any abrasive particles which will just grind deeper grooves than you want into the paint if you keep sanding in a circular motion. They may buff out but will take a lot more buffing. Use a hose with a fine sprayer in one hand and paper in other so that each stroke has it's debris washed away before the back stroke. Sanding will be quicker,take less paper,less strokes and will buff easier and look better. If you use the old bucket and sponge method , eventually you will have the "groovy paint" problem. It only takes ONE grain of dirt to make a mess going in circles!

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