Sanding Grit Progression: The Right Sequence for Every Project
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Skipping grits is the most common sanding mistake, and it shows up as visible scratches under stain or finish. The scratch pattern from 80-grit doesn't disappear under 220-grit. It hides, barely, and then the first coat of stain highlights every scratch like a highlighter pen on notebook paper. Proper grit progression removes the scratch pattern of each previous grit before moving on. It takes more time. The results are obviously better. Here's the sequence for different materials and finishes.
How Sandpaper Grits Work
The grit number refers to the number of abrasive particles per square inch of backing. Lower numbers mean fewer, larger particles that cut aggressively. Higher numbers mean more, smaller particles that leave a finer surface. 60-grit tears off material fast but leaves deep scratches. 400-grit barely removes material but leaves a surface smooth enough to reflect light.
Grits fall into rough categories. 40 to 60 is heavy stock removal: leveling joints, removing old paint, shaping wood. 80 to 120 is the working range for most projects. 150 to 220 is finish prep. 320 to 400 is between coats of finish. Above 400 is polishing, mostly for lacquer, auto paint, or metal.
The Standard Wood Progression
For bare wood that will be stained or finished with a clear coat, the baseline sequence is 80, 120, 150, 220. Start at 80 to flatten the surface and remove mill marks. Move to 120 to erase the 80-grit scratches. Then 150 to smooth the 120-grit pattern. Finish at 220, which is smooth enough for most stains and polyurethane.
If the wood is already fairly smooth (no mill marks, no rough spots), you can start at 120 and go 120, 150, 220. Softwoods like pine and cedar don't benefit from going past 220 before staining. The softer fibers crush and burnish at higher grits, which actually reduces stain absorption and creates blotchy results.
Hardwoods like oak, maple, and walnut can be taken to 320 before finishing if you want a glass-smooth surface under clear coat. Going higher than 320 on raw wood is usually wasted effort unless you're doing a rubbed lacquer or French polish finish.
Between-Coat Sanding
After applying a coat of polyurethane, varnish, or lacquer, sand lightly with 320 or 400 before the next coat. This isn't about smoothing the surface. It's about creating a mechanical bond (tooth) for the next coat to grip. Use light pressure. You're scuffing, not shaping. If you sand through the finish into bare wood, you've gone too far.
Water-based finishes raise the grain on the first coat, creating a rough, fuzzy surface. Sand with 320 after the first coat dries, wipe off the dust, and subsequent coats will lay down smooth. This grain-raising step is normal and expected. Some people pre-raise the grain by wiping with a damp cloth before the first finish coat, then sanding smooth at 220.
Metal Sanding Progressions
Metal follows the same principle but uses different grits and often different abrasive types. For removing rust or scale, start with 80 or 120. For prep before primer, end at 220 to 320. For polishing bare metal to a mirror finish, the progression goes much higher: 400, 600, 800, 1000, 1500, 2000, then polishing compound.
Aluminum and soft metals scratch easily. Start no lower than 120 unless you're removing deep defects. Stainless steel is the opposite: it's hard enough that 80-grit barely bites. Use the right abrasive type too. Silicon carbide (black sandpaper) works better on metal than aluminum oxide (brown/tan sandpaper).
Common Mistakes
Jumping from 80 straight to 220. The 220 paper can't remove the deep 80-grit scratches in any reasonable time. It just rounds over the tops of the scratch ridges while leaving the valleys intact. Under stain, those valleys show up as visible lines. Always step through intermediate grits.
Sanding with the tool's weight only. A random orbit sander weighs 3 to 5 lbs. That's enough pressure for finish sanding at 220. For 80-grit, you need to press down with moderate hand pressure. Not a lot, around 5 to 10 lbs of additional force. Too much pressure clogs the paper and creates heat, which burns the wood.
Frequently Asked Questions
Can I skip grits if I sand longer at each step?
No. Spending 10 minutes at 80-grit and then 10 minutes at 220-grit still leaves 80-grit scratch patterns. The 220 paper removes material too slowly to eliminate the deeper scratches. Each grit in the progression needs to fully replace the previous grit's scratch pattern, and that only works when the jump between grits is small enough.
How do I know when to move to the next grit?
Inspect the surface at a low angle with raking light (a flashlight held almost flat to the surface). When the scratch pattern is uniform with no deeper scratches from the previous grit visible, you're ready to move up. On light-colored wood, pencil marks rubbed across the surface work too: sand until all the pencil marks disappear.
What grit should I use before painting?
For primer, sand to 150 or 180. Paint fills minor scratches, so you don't need the 220 smoothness that stain requires. Between primer and paint, scuff with 220 to 320. The primer coat seals the wood, so you're just creating tooth for the paint to grip.
Does the type of sander matter for grit progression?
Yes. A belt sander at 80-grit removes material 3 to 4 times faster than a random orbit sander at 80-grit. Start with the belt sander for heavy work, then switch to the random orbit for 120 and above. Belt sanders leave directional scratch patterns that random orbit sanders are specifically built to avoid.
How long does sandpaper last?
Depends on the grit, material, and abrasive type. A single 80-grit disc on a random orbit sander lasts about 20 to 30 minutes of active sanding on softwood before the particles dull. Higher grits last longer because they remove less material per stroke. When the paper stops cutting and you're pushing harder to compensate, it's done. Using worn paper just generates heat.