Emery Cloth, Sandpaper

I do a lot of body work,sandpaper is a you get what you pay for product.most cheap paper is garbage.3m or Mirka is only 2 I found not to "load up" with fillers and paint,more bang for your buck.keep Emory around also for heavy duty rough stuff.holds up without tearing.
 
We have lots of types and grits from many places.

Estate and yard sales are good sources as sometimes harbor freight in their bulk packs sometimes have good grade in them.

3m seems to be better tan many but it depends on material and tools.

Our delta 330 sanders consume standard sheets in seconds but reused belts last longer.

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I have emery cloth in rolls and its listed by grit size. I have one roll of 3 inch I use for sanding blocks. It holds up 100 times better than paper on sanding blocks. My Emery rolls came from MSC, but there are lots of sources. I've got a granite counter top I glue sandpaper to for rough squaring arts, and a section I glue fine sand paper to for doing alight pass to remove mill marks on aluminum parts. I've been thinking about buying sheet size emery cloth for that too as the paper sanding sheets just don't hold up. Not even the wet or dry stuff.
 
Just don't use Emory for anything electrical like seating motor brushes or electrical contacts, etc. Use sand paper for these type work.
 
My go to is a piece of scrap corian counter-top in my lathe spindle with various abrasive compounds, glued on sandpaper, diamond paste, oxide polishes, corian makes an excellent lap, and it is easy to re-surface. Best of all you can typically find scrap corian for free!

It really all depends on what specifically you are trying to do.
 
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