DiamondCore Tools Flexible Diamond Sanding Pad  £37.78

Diamond grit on these 2.5″ x 2.5″ pads will smooth off porcelain, high-fired glaze or clay quickly and much more easily than any other type of sandpaper or abrasive. (1/4″ thick foam pad) Use wet or dry and also on bisque or glass.

60 grit (coarse)
120 grit (medium)
240 grit (fine)
400 grit (extra fine)
800 grit (ultra fine)
 

Sanding with diamond grit requires much less force, and many fewer hand strokes… which translates into far less fatigue and joint/muscle strain………. and much less time sanding.