Choose sandpaper by the defect you need to remove, not by a fixed project recipe. Coarse grit removes stock and deep scratches quickly; fine grit refines the scratch pattern. Start with the finest grade that will actually remove the current defects, then move to finer grades only when the surface is ready for them.
The basic rule: match grit to the work
Sandpaper grit describes the relative coarseness of the abrasive. A lower number cuts more aggressively, removes material faster and leaves deeper scratches. A higher number cuts more slowly and leaves a finer scratch pattern that is easier to hide under stain, paint or clear finish.
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The right starting point depends on three things: the condition of the wood, how much material must be removed and the finish system that will follow. A freshly planed board with a few machine marks needs a different start from a rough reclaimed plank, and bare-wood sanding is different from sanding a dried coating.
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Norton Abrasives advises starting with the finest grit that will remove the imperfections effectively. In its bare-wood examples, 80 grit is a typical starting point for planed or shaped wood with blemishes, while 100 grit is suggested when the wood has no blemishes. Those are starting examples, not a mandatory sequence for every board.
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Grit ranges and what they are for
Norton’s chart groups common woodworking work into the following ranges. The numbers are abrasive grades, not a promise that every paper with that number cuts identically; backing, abrasive type and tool pressure also affect behavior, so use the label on the paper you buy.
| Grit | Typical use | What to expect |
|---|---|---|
| 40–60 | Heavy sanding, stripping, dimensioning or shaping | Fast stock removal; leaves pronounced scratches that require several refining passes |
| 80–120 | Smoothing surfaces and removing small imperfections | Useful for correcting planer marks, shallow dents and uneven transitions |
| 150 | Fine surface preparation | Refines the scratches left by medium grades before finish preparation |
| 180 | Final surface smoothing and initial between-coat work | Suitable for a refined bare-wood surface or an early finish-coat pass when the finish maker permits it |
| 220 | After priming or staining; also used for paint and some sealer work | Removes raised fibers or minor nibs without the cut of a coarse grade |
| 320 | Between finish coats | Levels small dust nibs and roughness while preserving the underlying coat when used lightly |
| 360–400 | Final finish work | Very fine abrasion for the last refinement specified by the finish system |
These ranges overlap because the same grit can serve different purposes at different stages. A 180-grade paper may be a final bare-wood pass on one project, yet an early between-coat pass on another. The coating manufacturer’s preparation directions take priority over a general chart.
How to assess a board before choosing the starting grit
Planed or shaped wood with visible defects
Look for planer ridges, mill marks, shallow dents, glue squeeze-out, uneven joints and scratches running across the grain. If those defects are clearly visible or can be felt with a fingertip, Norton’s 80-grit example is a practical starting point. Use enough pressure to cut the defect, but do not keep sanding a low area simply to make it match a high area; that can change the part’s dimensions.
Planed or shaped wood without blemishes
When the surface is already even and free of visible defects, Norton gives 100 grit as an example starting grade. Beginning at 100 instead of 80 preserves more material and reduces the depth of the scratch pattern you must remove later.
Rough, stripped or badly uneven stock
Heavy removal, stripping and shaping fall in the 40–60 range in Norton’s chart. Such grades are for a specific removal job, not for finishing. Stop using them as soon as the surface is brought into a consistent shape, then step up to a medium grade so the deep scratches are not carried into the final finish.
Already smooth wood
If a board is flat, clean and already shows only fine scratches, starting coarser than necessary can create extra work. Test a small area with the finest grade likely to remove the remaining marks. If the marks remain, drop one step; if the test area cleans up, continue with that finer grade.
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Build a grit sequence instead of memorizing a ladder
There is no universal sequence such as “always use 80, 120, 180 and 220.” The correct ladder is the shortest one that removes the current defect and then the scratches from the previous pass.
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- Sand until the surface is uniformly worked. Do not change grit while isolated glossy strips, planer ridges or cross-grain marks remain. A partly sanded surface can make the next grade appear ineffective.
- Inspect under useful light. Raking light reveals scratches and low spots that diffuse room light hides. Mark persistent defects lightly with pencil if needed, then sand until the marks disappear.
- Remove dust before changing grades. Dust left on the work or pad can act like a stray coarse particle and create scratches that the next pass must remove.
- Move to a finer grade that removes the previous scratch pattern. The next grit is determined by what remains, not by the calendar or a fixed number of passes.
- Stop when the finish instructions say to stop. Over-sanding bare wood can alter how stain absorbs, while unnecessary polishing can reduce the mechanical tooth some coatings need.
Skipping a grade is acceptable when the current surface is already close to the target and the next paper can erase the existing scratches. Skipping is risky when moving from a very coarse grade to a much finer one: the finer paper may polish the peaks while leaving deep valleys, making defects difficult to detect until finish is applied.
Recommended process for bare wood
Bare wood is the surface before a sealer, stain, paint or clear coat has dried on it. Treat this stage separately from sanding a coating.
- Flatten and shape first. If the project needs heavy removal or joint correction, work in the 40–60 range only as long as necessary. For ordinary planed or shaped boards with blemishes, begin around 80; for clean boards, begin around 100.
- Refine the medium scratches. Continue through the 80–120 smoothing range until the defects from the first pass are gone. Choose the next grade by inspecting the actual scratch pattern.
- Prepare for the intended finish. Norton’s chart places 150 at fine surface preparation and 180 at final surface smoothing. Whether you stop at 150, 180 or use a finer grade depends on the finish maker’s instructions and the appearance required.
- Clean thoroughly. Vacuum or wipe away sanding dust without grinding it back into the pores. Sherwin-Williams specifically recommends removing dust between grit changes and sanding in the direction of the wood grain.
Always sand with the grain for the visible finishing passes. Cross-grain scratches are conspicuous after stain and are harder to remove than scratches aligned with the fibers. On edges and end grain, reduce pressure and inspect often because those areas can be cut more quickly than broad faces.
When sanding sealer, stain, primer or paint
A coating changes the objective: you are usually leveling nibs, raised fibers or small imperfections without cutting through the film. The finish maker’s label and technical instructions control the choice because products differ in hardness, drying behavior and required tooth.
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First sealer coat
Norton’s examples call for 180–220 grit on the first coat of an oil- or water-based finish. Use the lower end only when the coating instructions allow it and the surface needs more leveling; use the finer end when the coat is already smooth. Sand lightly and evenly rather than trying to remove the entire film.
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Paint
Norton lists 220 grit for sanding paint. This is a general example, not a substitute for the paint manufacturer’s recoat directions. Confirm that the coating is fully cured enough to sand; paper that clogs immediately or pulls the film indicates that the stage or product is not ready.
Between finish coats
Norton’s chart lists 320 grit between coats, while its broader chart also places 180–220 in initial between-coat work. The correct choice depends on how much leveling is required and what the finish maker specifies. Use the coarsest grade that fixes the defect without unnecessarily thinning the coat, then remove all dust before recoating.
Final finish work
Grades from 360 to 400 appear in Norton’s chart for final finish work. These papers refine an already smooth film; they are not intended to flatten major runs, ridges or drips. Correct substantial defects with the grade and method specified for that finish before attempting a final fine pass.
Use the abrasive format that fits the task
Choose sheets, discs or another format to match the hand tool or power sander you are using. The abrasive must sit flat and be secured as the tool manufacturer intends; an overhanging edge or poorly supported sheet can round profiles and create uneven pressure.
For hand sanding, a sheet wrapped around a firm block keeps broad faces flatter than a loose folded sheet. A soft interface can be useful on profiles, but it also follows hollows and may exaggerate unevenness. For power sanding, use the disc size and attachment pattern specified for the sander and keep the tool moving so one spot is not cut deeper than the rest.
Do not choose a paper solely by the number printed on a package. Compare the labeled grit system, the available range and whether the format suits your tool. The current evidence does not establish a particular brand, backing construction, adhesive system or product listing, so those attributes must be verified from the specific package.
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FEPA P grades and CAMI numbers are different labels
Sandpaper can be marked using FEPA grades, commonly shown with a “P” prefix, or CAMI numbers. A secondary comparison chart from Compel Group warns that the scales diverge at finer grits. Therefore, P180 and CAMI 180 should not automatically be treated as identical simply because the number is the same.
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| Prefix or system marking | A “P” generally signals a FEPA grade; an unprefixed number may use CAMI or another convention. |
| Manufacturer’s conversion information | Exact equivalence is not guaranteed at fine grades, so use the conversion guidance supplied for the paper. |
| Consistency within a project | Stay with one clearly identified grading system when progressing through a sequence, or record the system when changing products. |
| Finish instructions | If a coating maker specifies a grit, verify which grading system that number refers to before selecting paper. |
The Compel Group chart is a secondary reference rather than a standards-body specification for exact tolerances. When the distinction matters, rely on the abrasive label and the finish manufacturer’s instructions instead of assuming a numerical match.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Practical examples
A clean, newly planed tabletop
Inspect the top under raking light. If no blemishes are present, start around 100 grit, sand with the grain and remove dust. Move into the 120–150 range only after the first scratch pattern is uniform, then use 180 or the finish maker’s specified preparation grade. If staining, follow the stain directions for the final bare-wood grit; do not add a finer pass merely because the number is higher.
A tabletop with planer marks and shallow dents
Begin around 80 grit, concentrating on the defects while keeping the tool or block level. Once the planer marks are gone and the surface has an even 80-grit pattern, progress through a medium grade that removes those scratches. Inspect again before choosing 150 or 180 for fine preparation.
A stripped painted cabinet
After the old coating and residue are removed, determine whether the wood is uneven. Use 40–60 only for remaining heavy removal or shaping, then leave the coarse grade behind as soon as the surface is consistent. Refine through 80–120, clean the dust, and follow the primer or paint maker’s preparation instructions, which may call for 220 after priming.
A cured clear coat with dust nibs
Do not return to a coarse bare-wood grade. Use the between-coat grit specified for the product; Norton’s chart lists 320 as a common between-coat example. Sand only enough to level the nibs, remove dust completely and verify that the next coat can bond according to the product directions.
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Common mistakes and how to correct them
Starting too coarse
Symptom: The workpiece quickly develops deep scratches or loses an edge. Correction: Move to a finer grade as soon as the original defect is gone, then spend enough time removing the coarse scratch pattern before continuing.
Starting too fine
Symptom: The paper seems to polish the surface without removing planer marks, glue or dents. Correction: Drop to the finest lower grade that can cut the defect, work until the surface is uniform, then return to a refining sequence.
Changing grit too soon
Symptom: Glossy strips, cross-grain lines or isolated machine marks reappear after finishing. Correction: Finish the current pass across the whole area and inspect in raking light before changing paper.
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Skipping from coarse to fine
Symptom: The surface feels smooth but shows scratches after stain or clear coat. Correction: Use an intermediate grade capable of removing the deeper pattern; do not judge only by touch because fingertips can miss long shallow scratches.
Leaving dust between passes
Symptom: Random deep scratches appear despite using a finer paper. Correction: Vacuum or wipe the work, pad and surrounding area between grit changes, as Sherwin-Williams recommends.
Sanding across the grain
Symptom: Dark lines become visible after stain. Correction: Rework the affected area with the grain using a grade that removes the cross-grain marks, then progress normally.
Using the bare-wood recommendation on a coating
Symptom: A sealer or paint film is cut through, scratched excessively or becomes uneven. Correction: Stop and consult the coating maker’s stage-specific directions. Between-coat sanding is a separate operation from preparing bare wood.
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- What is the deepest defect: shaping, stripping, planer marks, small imperfections or only finish nibs?
- How much material can safely be removed without changing dimensions or profiles?
- Which grit system is printed on the package: FEPA P grade, CAMI number or another label?
- Are you sanding bare wood, a sealer, stain, primer, paint or a cured topcoat?
- What preparation grade does the finish maker specify for this product and stage?
- Have you sanded with the grain and removed dust before changing grit?
- Does the next grade remove the scratch pattern you can actually see, rather than following a memorized ladder?
The most reliable sequence is therefore project-specific: begin with the finest abrasive that removes the present defect, refine only after the surface is consistently worked, and let the finish manufacturer’s instructions decide the final preparation and between-coat grades.
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