We are going to show you the stages of polishing an Opihi Shell. The first picture is a dried shell filled with epoxy resin.
After sanding with 80 grit on a belt sander
After sanding with 120 grit on an orbital sander
After sanding with 240 grit on an orbital sander
After wet sanding with 600 and 2000 grit
After using a polisher