Sanding Grit Progression: The Right Sequence for Every Project

How Sandpaper Grits Work

The grit number refers to the number of abrasive particles per square inch of backing material. 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: Heavy stock removal. Leveling joints, removing old paint, shaping wood. This is aggressive work. A belt sander or random orbit sander with firm pressure.
• 80 to 120: The working range for most projects. Flattening surfaces, removing mill marks, initial smoothing. Most sanding sessions start here.
• 150 to 220: Finish prep. Smoothing the surface for stain or clear coat. Where most wood projects end before finishing.
• 320 to 400: Between coats of finish. Scuffing dried polyurethane or varnish for adhesion, not shaping.
• Above 400: Polishing. Mostly for lacquer, automotive paint, or bare metal. Rarely used on raw wood.

The abrasive material matters too. Aluminum oxide (brown or tan paper) is the standard for wood. Silicon carbide (black paper) cuts faster on metal and works well for wet sanding between finish coats. Ceramic abrasives (blue or purple) last the longest and cost the most, and they are best for heavy removal on hardwood or when using a belt sander.

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 run the shortened sequence: 120, 150, 220. This is common with pre-surfaced lumber from a home center or wood that has been through a thickness planer.

Softwoods like pine and cedar do not 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. Pine is already prone to blotchy staining, and over-sanding makes it worse. If you are staining pine, stop at 180 or 220 and use a pre-stain conditioner.

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 are doing a rubbed lacquer or French polish finish, where the surface preparation directly affects the final sheen.

Project-Specific Sequences

Different projects have different requirements. Here are the progressions that match common scenarios:

• Furniture refinishing (stripping old finish): 80, 120, 150, 220. Start with 80 after chemical stripping to remove residue and level the surface. If using a heat gun, start at 60 for stubborn spots, then 80, 120, 150, 220.
• New hardwood table or shelving: 120, 150, 220 (or 320 for a premium feel under clear coat). Pre-surfaced hardwood usually does not need 80-grit unless there are visible planer marks or tearout.
• Deck boards (new construction): 60 or 80 only. Deck stain and sealers penetrate better into a rougher surface. Over-sanding deck boards causes the finish to sit on top instead of soaking in, which leads to peeling. One pass with 60 or 80 to knock off splinters, then apply finish.
• Drywall patch before painting: 120 or 150, one grit only. You are smoothing joint compound, not wood. Compound is soft and sands quickly. Going coarser than 120 leaves scratches that show through paint. Going finer than 150 is wasted effort since primer fills the remaining texture.
• Painted cabinets (prep for repaint): 150 or 220, scuffing only. You are not removing the old paint. You are creating tooth for the new primer to grip. Light hand sanding or one pass with a random orbit sander at low speed.

Between-Coat Sanding

After applying a coat of polyurethane, varnish, or lacquer, sand lightly with 320 or 400 before the next coat. This is not about smoothing the surface. It is about creating a mechanical bond (called "tooth") for the next coat to grip. Use light pressure. You are scuffing, not shaping. If you sand through the finish into bare wood, you have gone too far and need to reapply the previous coat.

Water-based finishes raise the grain on the first coat, creating a rough, fuzzy surface. This is normal. Sand with 320 after the first coat dries (usually 2 to 4 hours), wipe off the dust with a tack cloth, and subsequent coats will lay down smooth. Some woodworkers pre-raise the grain by wiping with a damp cloth before the first finish coat, letting it dry, then sanding smooth at 220. This eliminates the surprise roughness after the first coat.

Oil-based finishes (polyurethane, spar varnish) do not raise the grain. Between coats, a light scuff with 320 is sufficient. Allow the full cure time specified on the can before sanding, typically 4 to 6 hours minimum. Sanding too early pulls up tacky finish and clogs the paper instantly.

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. The surface needs enough texture for primer to grip but should be free of deep scratches that would telegraph through paint.

For polishing bare metal to a mirror finish, the progression goes much higher: 400, 600, 800, 1000, 1500, 2000, then polishing compound. Each step removes the previous step's scratches until the surface reflects light uniformly. This is the process used on aluminum motorcycle parts, stainless steel appliances, and automotive trim.

Aluminum and other soft metals scratch easily. Start no lower than 120 unless you are removing deep pits or damage. Stainless steel is the opposite: it is hard enough that 80-grit barely bites, and you need to press firmly. Use silicon carbide (black paper) on metal rather than aluminum oxide (brown paper). Silicon carbide fractures into fresh cutting edges as it wears, maintaining its cut rate longer on hard surfaces.

Common Mistakes

Jumping grits. Going from 80 straight to 220 is the classic error. The 220 paper cannot 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. If you are tempted to skip 150, at least go 80, 120, 220. The jump from 120 to 220 is borderline but survivable on softwood. On hardwood, it leaves marks.

Too much pressure. A random orbit sander weighs 3 to 5 lbs. That is enough pressure for finish sanding at 220. For 80-grit, you need to press down with moderate hand pressure, around 5 to 10 lbs of additional force. Too much pressure clogs the paper and creates heat, which burns the wood (visible as dark patches) and melts the adhesive holding abrasive particles to the backing.

Using worn paper. Sandpaper cuts on the sharp edges of its abrasive particles. As those edges dull, the paper stops cutting and starts burnishing, which compresses wood fibers instead of removing them. Burnished wood does not absorb stain well. Replace paper when it stops cutting, even if it looks like it still has grit on it. The feel of fresh paper versus worn paper is obvious once you know the difference.

Sanding across the grain. On final passes (150 and 220), always sand with the grain. Cross-grain scratches are visible under any clear finish. A random orbit sander's circular pattern minimizes this, but for final passes on highly visible surfaces, hand sanding with the grain after the power sander gives the cleanest result.

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 are ready to move up. On light-colored wood, pencil marks rubbed across the surface work too: sand until all the pencil marks disappear. The pencil trick is especially useful for beginners because it gives you a clear, objective endpoint.

What grit should I use before painting?

For primer, sand to 150 or 180. Paint fills minor scratches, so you do not need the 220 smoothness that stain requires. Between primer and paint, scuff with 220 to 320. The primer coat seals the wood, so you are 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 designed to avoid. See our random orbit sander guide for model recommendations.

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 are pushing harder to compensate, it is done. Using worn paper just generates heat and burnishes the surface.

Related Reading

• Best Random Orbit Sanders
• Random Orbit Sander Guide
• What Is Grit?
• Corded vs. Cordless Tools