What's "relative grit" of scotchbrite gray pad - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-13-2008, 10:45 AM
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What's "relative grit" of scotchbrite gray pad

I'm color sanding the clearcoat on my frame and I've been using the following sequence (in this order - all wet sanding):

1) 800 grit to open the flat surfaces.
2) 1500 grit to do the brunt of the sanding.
3) Scotchbrite gray pad (ultra fine) to do edges, nooks, crannies AND over the entire surface to smooth things out between the flats and the edges/curves.
4) 2000 grit on all areas.

However, I'm wondering if I might have the scotchbrite out of order. If it is more coarse than the 1500 then I am just putting scratches back in that will be more difficult to remove with the 2000. Or is it even smoother than the 2000?

So where does the gray pad fit within those other grits of paper?

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Old 06-13-2008, 10:52 AM
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Try a little test on something to see which can remove scratches created by the other.
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Old 06-13-2008, 11:51 AM
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Here ya go !!!

Light Gray = Ultra fine = pn 07448
Tan = Medium = pn 7440
Gray = Medium = pn 7446B
Maroon = Very Fine = pn 7447
Brown = Fine = pn 6444

Relative grit - sure !!

And all found here - but a pain to drill down their website for color definition

http://www.3mestore.com/hand-pads.html

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Old 06-13-2008, 11:52 AM
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Quote:
Originally Posted by 123pugsy
Try a little test on something to see which can remove scratches created by the other.
That's part of my problem. I can't really detect all that much difference (such fine scratches and "old man" eyes don't help any either). But I'm afraid there MIGHT be a difference which will show up later when I start to buff and polish.
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Old 06-13-2008, 12:11 PM
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Originally Posted by Irelands child
Relative grit - sure !!
And all found here - but a pain to drill down their website for color definition
I had searched the mfr site and really don't find all that much helpful - at least for my needs. Unless I'm missing something on your link...these are pretty generic definitions of use/grit. It might be helpful when using one pad relative to another pad...but when using them mixed in with paper...not so much.

BTW Dave...you probably noticed I pretty much stole my sanding sequence from one of your prior posts. The 800 to get things opened up really seems to help speed the process. Just can't go to deep with it. I also substituted 1500 for your 1200 and then inserted the scotchbrite pad in the mix.

Did you use any scotchbrite at all in your color sanding? This frame is ALL nooks and crannies...so it's really helpful. On the big, flat body surfaces of the car itself I probably won't use it...or use it only sparingly.
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Old 06-13-2008, 12:14 PM
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The red is like 400 for painting on..,

the Grey is like 1000 for clearing/blending..

The red is not going to shape bodywork though it will provide tooth...
....just trying to keep it simple
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Old 06-13-2008, 12:34 PM
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Quote:
Originally Posted by cboy
BTW Dave...you probably noticed I pretty much stole my sanding sequence from one of your prior posts. The 800 to get things opened up really seems to help speed the process. Just can't go to deep with it. I also substituted 1500 for your 1200 and then inserted the scotchbrite pad in the mix.
I thought that your post had a familiar 'ring' to it

My Scotchbrite use was limited to a few nooks and crannies on the bare steel. I just couldn't get a good feel for it so for my wet sanding stayed with the only paper from 800 to 2000 where I could use a level surface pad of some sort. I had the "feel" that Scotchbrite on a painted panel will leave too many hills and valleys due to the thickness and the inconsistent levelness of the pad surface. I also moved from 1200 to 1500 as my intermediate paper. 1000 and 1200 were not enough of a jump after the 800. Many of the panels were just sanded with the 1500 then 2000 and on to the Presta 1500 and a wool buff then the Presta Swirl remover as my final buff using a foam pad.

As far as my frame - that's powder coated and the techs did a grit blast to white steel before application (guys, puhleeze!!!, don't start a chassis powder coat vs, paint debate. I can't take another one )

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Old 06-13-2008, 03:12 PM
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http://multimedia.3m.com/mws/mediawe...6EVs6E666666--
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Old 06-13-2008, 05:56 PM
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Thanks Milo and Scrimshaw. Sounds like I'd be better off using the gray pad BEFORE the 1500 rather than after.

Quote:
Originally Posted by Irelands child
I had the "feel" that Scotchbrite on a painted panel will leave too many hills and valleys due to the thickness and the inconsistent levelness of the pad surface.
I can see what you mean, particularly for larger regular body panels. We'll see if I get "waves" on my frame sections. BTW, I'm using small pieces (approx 2"x2") of fairly rigid 1/4" upholstery foam as a "block" for the sandpaper and for the scotch pad. Hopefully that will at least eliminate some of the finger grooves.
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Old 06-14-2008, 06:57 AM
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Don't use scotchbrite for colorsanding.
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