Maroon (red) Scotch-Brite

ct71rr

ct71rr

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Hello all, when everyone refers to the “red” Scotch-Brite pads, which are the correct ones? The “07747” which I have and are labeled “Primer Prep Scuff’ or the “7747” which are labeled “General Purpose”? Is there a difference?

07747:
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7747:
IMG_2042.jpeg
 
Yes, The same pad, 3M went from a 4 digit numbering system to a 5 digit, so all the old low numbers (9999 and below) now start with 0. In your pictures, you have a 7447 & 7747. They're the same grit, just different sizes.
 
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I'd love to see an updated chart. There are many versions of 3M scuff pad that are not represented in the above. It's strange to me why they seem to feel the need to be so opaque about the approximate grit range of their various offerings. It makes no sense.
 
crashtech said:
I'd love to see an updated chart. There are many versions of 3M scuff pad that are not represented in the above. It's strange to me why they seem to feel the need to be so opaque about the approximate grit range of their various offerings. It makes no sense.
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I agree. I downloaded that chart years ago when I was trying to figure out which color pads to use.
Got the correct Gray and Maroon numbers and basically stuck with them.
Just about out so maybe I'll try the Mirka pads.
 
I like the initial cutting of the 3M pads, but the Mirka seam to cut well for longer. With either pad, once they start to loose their effectiveness, you can peel them open and get more use on what used to be the inside of the pad. they will be half as thick but still work fine. I sell both, but around here I don't sell many, as the 3M factory where they are made is 30 miles away, and most of the shops know somebody that can get them roll edge cut scraps or 2nds that may look funny, but work as good as the ones sold.
 
Yes, the Mirlon are the ones.
Don't let the thinner pads fool you, they last and
are much easier to use in tight places.
 
I have the chart from 3m too but it only confused me more because the ones I have aren’t listed. The back of the box I have states this:
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Why not list the grit size?!
 
When I've asked similar questions about scotchbrite with a couple of different 3M techs who visited the Shops I was working at they told me that they don't list the actual grit because the abrasive and nylon used does not directly translate to grit size like in sandpaper. When they list a range of grit sizes for a pad it is an approximation. The amount of hand pressure can vary the actual scratches and as SB wears it cuts less and finer.

So with maroon for example a fresh piece with normal hand pressure will cut on the high side of the rated range which is 320-360. A fresh piece with more hand pressure would be on the low side. As the piece wears it starts cutting finer and finer. So 3M couldn't really list a specific grit size, only a range.

That's what I was told. Whether or not it's technically accurate IDK, but it makes sense.
 
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i am using the 64659 maroon pads. i really dont like the 7447 ones. they dont last as long and are harder to get into tight areas. i have tried the mirka pads. i still have a bunch of the grey ones here that are probably 15 years old. still have them because i always grab a 3m grey before the mirka. just dont like the mirka for some reason. they are super stiff and i always thought they wore out super fast.
 
If your pads are stiff, they're not the Mirka pads I use.
Being soft is why I like them
 

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Those are more like the thinner 3m ones i posted above. My mirka ones are like a piece of cardboard. They are old so maybe they changed them over the years
 
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