History of Sandpaper

 Sandpaper came about in the 13th century in China, they used a natural gum to bind stones, seeds, and shells to a piece of parchment. 

Sandpaper comes with different grits with roughness levels.

Glass paper was manufactured in London in 1833 by John Ockey, Glass paper is very small grits of glass that can be used as sandpaper. 

Then in 1921, 3M invented a sandpaper with silicon carbide grit and a waterproof adhesive named Wet and dry. This is the first application in automotive paint refinishing.

You can mount it to a wheel or on a sanding block, both have their uses.