Grit Rating
Affiliate link — we may earn a commissionGrit rating is the number of abrasive particles per square inch on a sheet of sandpaper. Lower numbers mean coarser, more aggressive abrasive. Higher numbers mean finer, smoother abrasive. 60-grit tears through old paint and rough lumber fast but leaves deep scratches. 120-grit smooths out surfaces for primer. 220-grit prepares bare wood for finish coats. Common progression: start at 80, move to 120, finish at 220. Jumping from 60 straight to 220 won't remove the deep scratches from 60. You have to step through the grits.
Why It Matters
Skipping grits shows in the finish. You'll see scratch patterns through stain and clear coat that can't be hidden. The 80, 120, 220 progression takes maybe 5 extra minutes per piece and produces a finish that looks intentional instead of rushed.