What Grit for Sanding Wood? A Clear Guide
You can spot poor sanding before the finish even dries. Scratches show through stain, paint highlights every ridge, and edges go fuzzy where they should look clean. If you are wondering what grit for sanding wood is right for the job, the answer depends on two things - the condition of the timber and the finish you want at the end.
There is no single grit that works for every project. A pine skirting board with old gloss on it needs a different approach from a hardwood tabletop, and both are different again from a quick de-nib between coats. Get the grit right, though, and everything that follows becomes easier. Paint sits better, stain looks more even, and the final surface feels properly finished rather than just coated.
What grit for sanding wood depends on
Sandpaper grit refers to how coarse or fine the abrasive is. Lower numbers are more aggressive and remove material quickly. Higher numbers are finer and refine the surface rather than reshape it.
As a practical starting point, 40 to 60 grit is for heavy removal, 80 grit is for stripping back rough timber or old finishes, 120 grit is a reliable general prep grit, 180 grit is commonly used for smoothing before finishing, and 240 grit or above is usually reserved for final refinement or sanding between coats.
The mistake most people make is jumping straight to a fine grit. Fine abrasives do not remove defects efficiently. They tend to polish the high spots while leaving machine marks, dents and coating edges in place. The better approach is to start as coarse as needed, then work up through the grades without skipping too far.
Choosing the right grit for each stage
For rough sawn or very uneven wood
If the timber is rough, splintered or visibly uneven, start coarse. Usually that means 60 or 80 grit. This stage is about flattening, removing saw marks and getting the surface into shape.
You do not want to stay too long on a very coarse grit, especially on softer woods such as pine. It can leave deep scratches that take longer to remove later. Once the surface is level, move on promptly to 100 or 120 grit.
For bare wood before paint
For most bare interior wood being prepared for primer and paint, 120 grit is a strong starting point. It smooths the surface without closing it up too much, which helps coatings bond well.
If the timber is already in decent condition, you can often move from 120 to 180 grit and stop there before priming. Paint does not usually need the same ultra-fine finish as clear varnish, but it does need a consistent surface. Any missed scratches or torn grain will stand out once the topcoat goes on.
For bare wood before stain or varnish
This is where grit choice matters most. Clear finishes and stains show the timber underneath, so poor prep is hard to hide.
A typical sequence is 80 grit if needed for levelling, then 120 grit, then 150 or 180 grit. For many hardwoods, stopping at 180 grit gives a good balance between smoothness and stain absorption. Sand much finer than that and some woods can take stain less evenly, particularly if you burnish the surface.
For varnish, lacquer or oil where you want a refined feel, 180 grit is a dependable finish-prep grit on most timbers. Some fine joinery can go to 220 or 240 grit, but this is an area where more is not always better.
For painted or varnished wood that only needs keying
If the old coating is sound and you are not stripping it off, you are not really sanding for removal. You are sanding to create a key. In that case, 120 to 180 grit is usually right.
Use 120 grit if the surface has brush marks, minor defects or a noticeable sheen that needs cutting back. Use 180 grit if the coating is already fairly smooth and you just need adhesion for the next coat. There is no benefit in attacking a sound finish with 60 grit and creating extra repair work.
Between coats of primer, paint or varnish
For denibbing between coats, use a finer grit. Usually 240 grit works well, and sometimes 320 grit for finer finishing systems. The aim is not to remove the coating, only to knock back dust nibs, raised grain or slight texture.
Keep pressure light. If you sand aggressively between coats, you can cut through on edges and corners very quickly, which means more patching and another coat to recover it.
A simple grit guide for common jobs
For most wood preparation, these are reliable ranges to work from:
- 60 to 80 grit for rough timber, heavy old coatings and major levelling
- 100 to 120 grit for general preparation and initial smoothing
- 150 to 180 grit for finish prep on bare wood
- 240 to 320 grit for sanding between coats
What grit for sanding wood by finish type
Before painting
If you are painting skirting, doors, architraves, furniture or panelling, stop finer than rough prep but not excessively fine. On bare wood, 120 to 180 grit is usually ideal. On previously painted surfaces, 120 to 180 grit gives a good key.
If a primer is going on next, that primer often does part of the refining work. Once it is dry, a light sand with 180 to 240 grit can tidy the surface before topcoat application.
Before staining
Stain tends to exaggerate sanding scratches and uneven prep, so consistency matters more than chasing the finest possible surface. Finishing at 150 or 180 grit is usually the safest option for an even result.
Test pieces are worth doing, particularly on oak, pine and mixed-grain timbers. A board sanded to 120 grit can take stain noticeably darker than the same board taken to 180 grit.
Before clear varnish or oil
For a clear finish, 180 grit is a dependable final prep point for most projects. If the piece is high-end joinery or furniture and the timber suits it, 220 grit can work well. Just be careful not to over-polish the surface before applying products that need some absorption.
Common sanding mistakes that affect the finish
Using the wrong grit is only part of the problem. Technique matters just as much.
Skipping from a coarse grit straight to a fine one saves no time. It usually leaves scratches from the earlier stage that only become obvious when the finish hits them. Moving through sensible increments gives a cleaner result and often works faster overall.
Sanding across the grain is another common issue, especially with aggressive grits. On raw timber, always finish with the grain. Cross-grain scratches are hard to hide, particularly under stain and satin varnish.
Too much pressure is also a problem. Let the abrasive do the work. Leaning heavily on the paper or machine can create uneven patches, swirl marks and clogged abrasives. A fresh disc or sheet used correctly will outperform a worn one forced through the job.
Dust control matters too. If sanding dust sits on the surface, it can mask scratches during prep and then spoil the finish later. Vacuum thoroughly and wipe down before coating.
Hand sanding or machine sanding?
For flat areas and larger jobs, a random orbital sander is usually the most efficient option. It gives a more even scratch pattern and speeds up prep considerably. For mouldings, corners and detail work, hand sanding is still essential.
The key is to match the grit to the method. A machine with 80 grit removes material quickly, sometimes faster than expected. On edges and profiled timber, it pays to step down in aggression and finish by hand where needed. That is how you keep sharp details without flattening them off.
When to stop sanding
A surface is ready not when it feels shiny-smooth, but when it is uniformly prepared for the coating you plan to apply. That means no visible scratches from the previous grit, no glossy patches where old finish remains, and no rough fibres waiting to stand up under the first coat.
If you are painting, think clean, even and keyed. If you are staining or varnishing, think consistent and refined. Those are not always the same thing, which is why the best grit for one project can be the wrong one for the next.
For most jobs, the safest approach is simple: start coarse only if the surface needs it, work up in stages, and stop at the grit that suits the finish rather than the highest number on the pack. If you get that part right, the rest of the job tends to go the way it should.
