Unsanded is a synonym of unsandpapered.
As adjectives the difference between unsanded and unsandpapered
is that unsanded
is not sanded (abraded or cleaned) while unsandpapered
is not sandpapered.
As a noun sandpaper
is a strong paper coated with sand or other abrasive material for smoothing and polishing.
As a verb sandpaper
is to polish or grind (a surface) with or as if with sandpaper.
As an adjective unsandpapered is