Sandpaper Grit for DIYers: When to Start at 40 or Finish at 1,500

For most wood projects, go 80 then 120 then 180 then 220. Start coarser (40 to 60) for stripping paint or old finish, and finish finer (400 and up, often wet) when polishing a clear coat or metal. Grit numbers follow the CAMI standard common in North America, and we carry sanding discs built around that range. Dust control matters just as much as grit choice, and we cover that right after the chart below.

TL;DR:

• A P prefix marks FEPA paper, which cuts slightly more aggressively than CAMI paper with the same number; check labels before matching discs.
• On veneer and plastic, start at 150 or finer; coarser abrasives can break through thin veneer or leave scratches that remain visible.
• Advance only after each grit removes the previous scratch pattern, checking with low angled light; jumping steps often leaves marks visible beneath paint.
• Connect a vacuum to the sander and wear a respirator approved by NIOSH indoors or when sanding composite materials; clean with a HEPA vacuum.

Table of Contents

• Sandpaper Grit Chart: What the Numbers Actually Mean
• Which Grit Should You Start With for Your Project?
• How to Work Through the Grits Without Leaving Scratches
• Wet Sanding and Polishing: When to Go Past 320
• Picking the Right Abrasive Type and Backing for the Job
• Dust Control and Respiratory Safety While Sanding
• A Practical Starter Kit for Grit Sanding at Home
• When Good Enough Beats Perfect on a Home Project
• Sanding Discs and Polishing Supplies Worth Having on Hand
• FAQ
• Sources

Sandpaper Grit Chart: What the Numbers Actually Mean

Grit numbers tell you how many abrasive particles fit in a square inch of sandpaper. More particles mean each one is smaller, so a higher number always means a finer, smoother cut. A 40-grit sheet carries large, aggressive particles that rip through material fast, while a 1500-grit disc has particles almost too small to see, meant for polishing rather than removal.

Two labeling systems show up on sandpaper packaging. CAMI is the system most American woodworkers grew up with, and it is what you will see on most hardware store shelves. FEPA, marked with a “P” prefix, is common on European-made abrasives and on automotive paper. For the same printed number, a P-grade is typically a little coarser than its CAMI counterpart, so a P220 cuts slightly more aggressively than a plain 220.

A few practical notes make this chart easier to use at the store:

• Packaging that just says “coarse,” “medium,” or “fine” without a number is using the same grade buckets described above, so you can still shop by name.
• If a sheet is marked with a “P,” expect it to feel slightly more aggressive than a non-P sheet with the same number.
• Mixed-grit packs sold for multipurpose use often skip numbers between 150 and 220, which is fine since those steps overlap in effect.

Which Grit Should You Start With for Your Project?

The fastest way to waste a sanding session is starting too fine. If the surface still shows mill marks, old stain, or heavy paint and you grab 150-grit, you will be there for an hour accomplishing almost nothing. The rule of thumb: pick the coarsest grit that removes the defect without gouging the material underneath, then work up from there.

Here is where to start for common jobs and materials:

• Bare softwood (pine, cedar): Start at 80 for mill marks and surface roughness, then move to 120 and 150.
• Hardwood (oak, maple, walnut): Start at 100 to 120 since these woods are denser and show scratches less at a slightly finer first pass.
• Painted surfaces you plan to repaint: Start at 120 to 150 just to scuff the surface for adhesion, not to strip it.
• Heavy paint or varnish removal: Start at 40 to 60, since this is genuine stock removal work, not smoothing.
• Old finish or polyurethane removal: Start at 60 to 80, especially if the finish has yellowed or cracked.
• Metal and light rust: Start at 80 to 120 for surface rust, dropping to 40 to 60 only for heavy corrosion or pitting.
• Drywall joint compound: Start at 120 to 150, using a sanding sponge or pole sander rather than aggressive grits that gouge paper-faced drywall.
• Plastics and veneer: Start no coarser than 150, since thin veneer sands through fast and most plastics scratch visibly at anything coarser.

A quick way to translate these into ranges you will see on packaging: paint removal sits around 40 to 80, heavy finish removal around 40 to 60, general surface prep around 80 to 120, and finish prep right before stain or topcoat around 150 to 220. The Popular Mechanics grit guide lays out similar ranges, from extra-coarse at 24 to 36 up through polishing grits past 400, and those numbers track closely with what shows up on most hardware store packaging.

Veneer deserves a specific warning. Many veneered panels have a layer thinner than a business card glued to a substrate, and anything coarser than 150 risks sanding straight through to the glue line or substrate color. If you are refinishing a veneered dresser or tabletop, work slowly at 150 and check your progress often rather than assuming the piece can take the same treatment as solid wood.

Metal work has its own wrinkle: rust removal at low grits (40 to 60) leaves deep scratches that need several intermediate steps, typically 80, then 120, then 220, before the surface is smooth enough for primer. Skipping straight from 60 to 220 on metal almost always leaves visible scratch patterns once paint goes on, because paint telegraphs surface texture more than people expect.

One mistake shows up across nearly every skill level: starting with too fine a grit or jumping too many steps at once, which leaves visible scratches that persist even after a finish is applied. The fix is straightforward: fully remove the scratch pattern from one grit before moving to the next, rather than assuming a quick pass will “blend it in” later, a point echoed in Woodworking Network’s grit selection guide.

How to Work Through the Grits Without Leaving Scratches

Sanding in the right order matters more than sanding for a long time. A methodical pass through each grit, with proper technique at each stage, produces a smoother result in less total time than aggressive sanding at a single grit.

Here is a sequence for refinishing a piece of furniture with an old finish:

1. Strip or scuff the old finish with 60 to 80 grit, working with the grain, until the surface feels uniformly rough with no shiny patches of old topcoat remaining.
2. Level the surface with 100 to 120 grit, removing the scratch pattern left by the first grit.
3. Smooth for stain or paint with 150 grit, checking under raking light for any remaining coarse scratches.
4. Final prep with 180 to 220 grit, which is typically where you stop before most stains and many paints.
5. Clean thoroughly with a vacuum and tack cloth before applying any finish, since dust trapped under a topcoat telegraphs through as texture.

For paint prep on trim or cabinetry already primed and ready for a topcoat, a shorter sequence works: scuff at 150 to 220, wipe clean, and paint. There is no need to start coarse if the surface is already flat and just needs adhesion texture.

For edge smoothing on cut boards, start at 120, move to 150, and finish at 220, working in the direction of the grain at each step to avoid cross-grain scratches that show under stain.

Technique matters as much as grit choice, and 3M’s random-orbital sanding guide lays out the fundamentals that most DIYers skip. Overlap each pass by about half the pad’s width so you are not leaving thin unsanded strips between passes. Plan on two to four full passes over an area per grit step before moving on, since more than that wastes time and fewer leaves scratches behind. Always start the sander moving before it touches the surface, and lift it completely off before stopping, since a sander that starts or stops while sitting still on the wood will dig a visible divot.

Between grit changes, clean the surface with a vacuum or tack cloth. Loose coarse particles left behind from the previous grit can embed in the new sandpaper and gouge scratches that are deeper than the grit you are currently using, undoing your progress.

To check whether you have fully removed the previous grit’s scratches, angle a work light across the surface at a low, raking angle. Scratches that are invisible under overhead light often show up clearly this way. If you see scratch lines running against the direction of your current sanding, go back one grit and work that spot again before advancing.

Jumping a grit step is sometimes fine, particularly on softwood with simple mill marks, where going from 80 straight to 150 can work if you spend extra passes at each stage. Jumping on hardwood or over a stripped finish usually backfires, since the larger scratch pattern takes much longer to erase at a finer grit than it would have taken to remove at an intermediate one.

Pro Tip: Swirl marks from random orbital sanders usually come from debris trapped under the pad or from stopping the sander while it’s still touching the wood. Check your sanding pad for stuck particles between grit changes and always lift the sander clear before switching it off.

Wet Sanding and Polishing: When to Go Past 320

Dry sanding works for almost everything up through surface prep, but certain finishes need wet sanding to look right. Wet sanding uses water or a mild lubricant to float away debris and heat as you sand, which prevents the fine particles from clogging the paper and keeps the surface from overheating, a concern especially with clear coats and some plastics.

Clear coats, automotive paint, and metal polishing are the main places wet sanding earns its keep. Scuffing between coats of a clear finish typically happens at 320 to 400, dry or wet depending on the product. Moving into actual polishing territory, 600 to 1500 grit is the common range for leveling out orange peel or minor imperfections in a clear coat, and anything past 1500 moves into ultra-fine polishing meant to remove only the finest haze before a final buff.

• Dry sanding is faster and fine for most wood prep work through 220 grit.
• Wet sanding shines on clear coats, automotive finishes, and metal, where heat and clogging are real problems.
• Keep pressure light when wet sanding. The water is doing part of the cutting work, and heavy pressure just gouges the surface.
• A few drops of dish soap in the water reduces friction further, which is standard practice for automotive wet sanding.
• Rinse the abrasive often. A clogged wet sanding disc stops cutting evenly and can leave random deep scratches.

3M’s finishing guidance for high-gloss work emphasizes exactly this kind of damp sanding protocol between grit steps on clear coats, since clean, cool sanding at each stage is what produces a swirl-free final polish rather than a hazy one, according to 3M’s perfect-it finishing system guidance.

Polishing is a related but distinct step from sanding, and it is worth understanding the difference before you reach for a buffing wheel. On automotive surfaces, polishing works on a finer scale than even the smallest sandpaper grit, removing light scratches and restoring gloss without cutting into the material the way sandpaper does, a distinction explained well in Phenomenal Auto Care’s breakdown of polishing versus sanding. If you have wet-sanded a clear coat to 1500 or 2000 grit, polishing is usually the next and final step to bring back full shine.

Picking the Right Abrasive Type and Backing for the Job

Not all sandpaper is the same material, and the mineral used changes how fast it cuts and how long it lasts. Garnet is a natural mineral, relatively inexpensive, and cuts well on bare wood, though it wears down faster than synthetic options. Aluminum oxide is the most common all-purpose abrasive, durable enough for wood, painted surfaces, and metal, which is why it dominates general-purpose sandpaper aisles. Silicon carbide is sharper and better suited to wet sanding, finishes, and non-ferrous metals, and it is the typical choice for fine and ultra-fine polishing grits. Ceramic abrasives cut the most aggressively and last the longest under heavy use, making them common on belt sanders for high-volume material removal rather than everyday hand sanding.

Backing material matters too. Paper-backed sandpaper is the standard, inexpensive choice for hand sanding and most orbital sanders. Cloth-backed abrasives flex better and hold up to more aggressive use, common on sanding belts. Film-backed discs, often used for the finest grits, resist tearing and provide a more consistent surface for polishing work.

• Open-coat abrasives have gaps between particles, which resist clogging and work well on softwood, paint, and other gummy materials.
• Closed-coat abrasives pack particles tightly for a more aggressive, uniform cut, typically used on hardwood and metal where clogging is less of an issue.
• Belt sanders generally pair best with cloth-backed aluminum oxide or ceramic abrasives for durability under heavy use.
• Random orbital sanders and hand sanding blocks work well with standard paper-backed aluminum oxide or garnet for most wood tasks.
• Fine polishing discs, including the ultra-fine grits used on metal and clear coats, typically use film backing for consistency.

Dust Control and Respiratory Safety While Sanding

Sanding dust is not just a cleanup nuisance. Fine particles generated by sanding, especially on materials like drywall compound, concrete-based products, or composite materials, can include respirable crystalline silica, and OSHA’s standard for respirable crystalline silica requires exposure controls and respiratory protection for tasks that generate this kind of dust, with engineering controls like vacuum dust collection specified for many construction-related sanding tasks.

For home projects, the practical takeaway is straightforward: control dust at the source rather than cleaning it up afterward. A vacuum dust collection system attached directly to your sander captures most particles before they become airborne, which is a meaningfully different outcome than sanding freely and vacuuming the floor after. For indoor work or any sanding on composite materials, pairing that with a NIOSH-approved respirator adds a second layer of protection that engineering controls alone do not fully replace.

• Attach a vacuum dust collection system or shop vac directly to your sander whenever the tool supports it, rather than relying on a dust bag alone.
• Wear a NIOSH-approved respirator for indoor sanding, sanding composite materials, or any job generating heavy dust, not just a basic dust mask.
• Ventilate the workspace with open windows or a fan exhausting outward, especially for extended sanding sessions.
• Never use compressed air to blow dust off surfaces or clothing, since this just redistributes fine particles into the air you are breathing.
• Clean up with a HEPA-rated vacuum rather than a broom, since sweeping stirs dust back into the air rather than removing it.
• Change vacuum filters and bags carefully, outdoors when possible, to avoid releasing accumulated fine dust all at once.

A HEPA-capable shop vacuum makes a real difference here, and understanding the difference between a standard shop vac and a HEPA-rated unit is worth a few minutes if you are setting up a dedicated sanding station; our comparison of shop vacs and household vacuums walks through what to look for.

Pro Tip: Keep a respirator and a dedicated vacuum attachment stored right next to your sander, not in a separate toolbox. The gear you have to dig for is the gear you skip.

A Practical Starter Kit for Grit Sanding at Home

The most common mistake we see is a half-finished set of random mismatched sandpaper sheets, missing exactly the grit needed for the job at hand. A small, deliberate starter kit solves this permanently and costs less than replacing damaged or wasted materials from using the wrong grit.

A sensible starter kit includes:

• A core grit range covering 80, 120, 150, 220, and at least one fine polishing grit like 400 or above.
• A random orbital sander or a simple sanding block for hand work, matched to the scale of your typical projects.
• A HEPA-rated shop vacuum or vacuum dust collection attachment, plus a NIOSH-approved respirator for indoor and composite sanding.
• Tack cloths for final cleanup before applying any finish.
• Water and a few drops of dish soap on hand for any wet sanding steps past 400 grit.

For the fine end of that range, our RBL GEOTek™ Engineered Abrasives SD6-1500 discs cover the polishing step between scuffing and a final gloss finish, useful for clear coats and smooth metal work. Moving further into ultra-fine territory, the RBL GEOTek™ Engineered Abrasives SD6-3000 discs handle the last pass before buffing on automotive-grade finishes and polished metal surfaces. For smaller detail and curved-surface work, a 60-piece sandpaper disc pack spanning coarse to fine grits at a compact 43mm diameter gives you options for detail sanding on small parts, hardware, and tight curves where a full-size disc will not fit.

If you are also setting up a dedicated workspace for projects like these, a stable bench surface protects both your tools and your work; our guide to building a durable workbench top covers a simple two-layer plywood approach with a sacrificial top skin.

When Good Enough Beats Perfect on a Home Project

After years of helping homeowners sort through sanding questions, the biggest pattern I see is over-sanding items that do not need it. A painted kitchen cabinet does not need the same finish work as an heirloom table getting a clear coat. If paint is going over it, 150 to 220 grit is usually the ceiling worth chasing, since paint hides minor texture that a clear finish would expose immediately.

Set your stopping point based on the finish and the object’s purpose, not out of habit. A kid’s workbench project or a garage shelf rarely justifies chasing a glass-smooth surface, while a piece going under a glossy topcoat does. If you are working on a project with kids, our practical guide to teaching kids woodworking has some useful ground rules for matching effort to the project.

Match your sanding time to what the finish will actually show, and you will save hours without sacrificing results.

— Thane Holland

Sanding Discs and Polishing Supplies Worth Having on Hand

Having the right grits available when a project starts saves a trip to the store mid-job. We carry a few specific sanding products built for the finer end of the grit range, where quality matters most for a clean final result.

• The RBL GEOTek™ Engineered Abrasives SD6-1500 disc is built for polishing steps on clear coats and smooth metal, right where dry sanding stops being enough.
• The RBL GEOTek™ Engineered Abrasives SD6-3000 disc handles the final ultra-fine pass before buffing, suited to automotive-grade and polished metal finishes.
• The 60-piece sandpaper disc pack covers coarse through fine grits at a compact size, handy for detail work and small parts.

Browse our full selection of home, yard, and garage essentials to round out your sanding setup and find whatever else your current project needs.

FAQ

When should you use 1500 grit sandpaper?

Use 1500 grit for polishing steps on clear coats, automotive finishes, or smooth metal, after you have already sanded through the coarser and medium grits. It is a step for removing fine haze and prepping a surface for buffing, not for leveling or shaping material. Wet sanding at this grit typically produces the smoothest, most consistent result.

Is 400 grit finer than 600 grit?

No, 600 grit is finer than 400 grit. Following the CAMI numbering system, higher numbers always indicate finer abrasives, so 600 removes material more gently and leaves a smoother surface than 400.

Is 60 or 80 grit sandpaper better for sanding?

Neither grit is universally better since the right choice depends on the job: 60 grit suits heavier material removal like stripping paint or leveling rough, damaged wood, while 80 grit works well for general surface prep on bare wood that does not need aggressive stock removal. Starting with the coarsest grit that still removes your specific defect, without gouging the surface, is the better approach than defaulting to one or the other.

Is 120 or 150 grit sandpaper finer?

150 grit is finer than 120 grit. Both fall in the fine range typically used for smoothing wood before staining or painting, with 150 leaving a smoother surface and 120 cutting slightly faster when you still have minor imperfections to remove.

Sources

• How to choose sandpaper | Woodworking Network
• Random-orbital sanding guide (3M)
• 29 CFR 1926.1153 — Respirable crystalline silica
• Sandpaper grit guide — Popular Mechanics

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