Choose 280 grit when small defects still require correction and 320 grit when the surface is level and needs a lighter, uniform preparation pattern.
Compare 100 and 120 grit sandpaper by cutting speed, scratch pattern, surface condition, and the next step in your sanding sequence.
Learn what 60 grit sandpaper is used for, when it is too aggressive, and how to move toward finer grits without leaving deep scratches.
Learn where 180 grit sandpaper fits after 150 grit, when it can be a finish-prep step, and when to move to 220 grit.
Learn where 150 grit sandpaper fits between 120 and 180 grit, what it is best for, and how to avoid leaving visible finish scratches.
Learn when 120 grit sandpaper is the right starting or follow-up grit, how it differs from 100 and 150 grit, and how to avoid over-sanding.
Learn where 100 grit sandpaper fits, what it removes well, what it leaves behind, and when to move to 120 or finer grit.
Build a simple sanding grit ledger that records the material, finish, abrasive sequence, method, observations, and result for repeatable work.
If your MDF shelves has marks, uneven sheen, or visible scratches, sanding is the fastest way to reset the surface and get back to a controlled finish. The key is to remove damage efficiently while keeping the scratch pattern consistent...