What Grit Sandpaper for Wood Before Painting? (80-220)
For wood before painting, use 80-120 grit to strip old finish, then 150-220 grit to smooth the surface, and stop there. Sanding finer than 220 polishes the wood and removes the microscopic “tooth” paint needs to grip, which can cause peeling or poor adhesion. This range leaves wood smooth enough for a flawless coat but rough enough for primer to bite into.
Before painting, it’s important to prepare the surface properly to achieve a smooth and flawless finish. Sanding with the right grit removes imperfections, smooths rough spots, and creates a surface that promotes better paint adhesion — but going too far in the other direction (over-sanding) causes its own problems, which is a step most guides skip.
Quick Answer
Strip old paint/finish with 80-120 grit, then smooth with 150-220 grit right before priming. Don’t sand past 220 grit on bare wood headed for paint — finer grits leave too smooth a surface for paint to properly bond to.
Different Grits Of Sandpaper And Their Uses
Choosing the right grit sandpaper is essential for achieving optimal results when prepping wood for paint. Different grits are designed for different stages of the job. Here’s how they break down.
Coarse Grit Sandpaper (40-80)
Coarse grit sandpaper is the most aggressive option. It’s used for heavy-duty sanding tasks, including removing old paint, stubborn stains, and deep scratches. It won’t create a smooth finish on its own — it’s for stripping away layers so a finer grit can take over. Use it with caution, since it removes material quickly and can gouge softer woods.
Medium Grit Sandpaper (100-150)
Medium grit sandpaper strikes a balance between aggressiveness and smoothness. It’s ideal for removing minor imperfections, smoothing uneven surfaces, and preparing wood for painting after an initial coarse pass. This is the grit that gets wood “paint ready” for most projects that aren’t stripping old finish.
Fine Grit Sandpaper (180-220)
Fine grit sandpaper is the last stop before paint for bare or previously-stripped wood. It removes small scratches left by medium grit and refines the surface. Fine grit is also what you use for a light scuff-sand between coats once primer or paint has fully cured, to knock down dust nibs and help the next coat bond.
Extra Fine Grit Sandpaper (220+) — Use With Caution Before Paint
Extra fine grit sandpaper (above 220) is the highest level of refinement, and it’s genuinely useful for finishes like lacquer or a glass-smooth clear coat. But for wood that’s about to be painted, going this fine before the first coat can work against you: it polishes the surface and reduces the physical texture (“tooth”) paint needs to mechanically grip. On dense hardwoods especially, over-sanding can leave a surface too slick for good adhesion.
Grit Progression: Why The Order Matters (Not Just The Number)
A single grit number isn’t the full answer — the sequence you sand in matters just as much. Skipping steps leaves deeper scratches behind, and stopping at the wrong grit either leaves the surface too rough or, just as bad, too smooth for paint to hold onto. Here’s the progression trade professionals typically follow for wood headed for paint, based on guidance from paint-industry sources like Rawlins Paints and The Craftsman Blog:
| Stage | Grit | Purpose |
|---|---|---|
| 1. Strip / level | 80-120 | Remove old paint, varnish, or rough-sawn texture (start at 60-80 for rough-sawn lumber) |
| 2. Smooth | 150 | Even out the surface and remove scratches left by the coarser grit |
| 3. Pre-paint finish | 220 | Final pass before primer — stop here for painting, don’t go finer |
| Between coats (after primer cures) | 240-320 | Light scuff-sand to knock down dust nibs, not a full re-sand |
Why over-sanding hurts paint adhesion: paint bonds partly by mechanical grip and partly by soaking slightly into the wood’s surface texture. Sanding past roughly 220-240 grit on bare wood polishes it smooth, closing off that texture. Paint applied to an over-sanded, glass-smooth surface has less to hold onto and is more prone to peeling or poor film formation, especially on dense hardwoods. The goal before painting is a clean, lightly-keyed surface, not a mirror finish.
Before priming vs. before the topcoat: these are two different sanding jobs. On bare wood before the first coat (primer), stop at 220 grit. Once primer is fully cured and you’re prepping for the topcoat, a light 240-320 grit scuff-sand is enough — you’re only removing dust nibs and giving the topcoat a touch of grip, not re-leveling the wood.
Choosing The Right Grit Sandpaper For Wood
When it comes to painting wood, the key to a smooth, flawless finish lies in proper preparation. With the wide variety of sandpaper grits available, it can be confusing to determine the right one. Consider both the condition of the wood surface and the type of paint you’ll apply.
Determining The Condition Of The Wood Surface
Before you begin sanding, assess the condition of the wood surface to determine your starting grit:
- Smoothness: If the surface is already relatively smooth, with minimal blemishes, start with a finer grit (120-150).
- Roughness: If the wood has rough spots, visible scratches, or old layers of paint or varnish, start with a coarser grit (60-80) to remove those imperfections first.
- Damaged areas: Deep gouges, cracks, or other damage may need filling or patching before sanding. Sanding alone can still smooth minor imperfections around repaired areas.
Considering The Type Of Paint To Be Applied
The type of paint also affects your final sanding grit. Here are general guidelines (always check the specific product’s own instructions too):
| Type of Paint | Recommended Final Grit |
|---|---|
| Water-based paints and primers | 150-220 grit |
| Oil-based paints and primers | 150-220 grit |
| High-gloss finishes (after primer, between coats) | 240-320 grit |
| Stains and varnishes (not paint) | Can go finer, up to 220-320, since stain doesn’t need the same mechanical “tooth” |
Note: these are general recommendations and may vary by product and manufacturer. Always check the paint manufacturer’s own surface-prep instructions.
Step-by-step Guide To Prepping Wood With Sandpaper
Properly prepping wood is essential before painting to ensure a smooth, long-lasting finish. Sanding removes imperfections, roughness, and old paint or stain, creating a clean surface for paint adhesion. Follow this step-by-step process.
Inspecting The Wood Surface
Before sanding, inspect the wood for cracks, dents, or peeling paint that need extra attention. Address these problems before sanding for a smooth, even finish.
Removing Old Paint Or Stain
If there’s existing paint or stain, use a scraper, paint stripper, or 80-grit sandpaper to remove it. Wear protective eyewear and a mask to avoid inhaling fumes or particles.
Sanding The Surface Smooth
Once old finish is removed, sand the wood surface in stages: start with 80-120 grit for any remaining roughness, then move to 150 grit, then finish at 220 grit. Sand in the direction of the wood grain using long, even strokes, and sand the entire surface evenly — don’t skip grit steps.
Cleaning The Wood
After sanding, remove dust and debris with a vacuum or soft brush, then wipe with a slightly damp cloth. A clean, dust-free surface is essential for good paint adhesion.
Final Inspection And Touch-ups
Once the surface is clean and dry, inspect it for remaining imperfections. Lightly sand rough spots with 220-grit sandpaper if needed, then wipe away dust before painting.
“Before painting, the aim is a clean, smooth, lightly keyed surface, not a glass-like finish… over-sanding, especially with higher-grit sandpaper, could lose adhesion.” — Rawlins Paints, trade paint supplier
Grit-Progression Sandpaper Pack & Sander
3M Pro Grade Precision Reusable Sanding Kit (80/120/220 Grit)
Covers the strip (80), smooth (120), and pre-paint finish (220) stages from this guide in one reusable kit, generally $10-15.
Check Price on Amazon
BLACK+DECKER 5″ Random Orbital Sander (BDERO100)
Speeds up the coarse-grit stripping stage on large flat panels or tabletops, around $33.
Check Price on AmazonRelated Sanding Guides
For furniture-specific projects, see our full breakdown of what grit sandpaper to use for wood furniture before painting. For a broader look at grit selection across all woodworking tasks (not just painting), see what grit sandpaper for wood: complete grit guide by task. If you’re sanding between coats specifically, our guide to sanding between coats of paint covers that stage in more depth.
Frequently Asked Questions On What Grit Sandpaper For Wood Before Painting
What Grit Sandpaper Is Best For Prepping For Paint?
The best grit sandpaper for prepping paint is generally 120 to 220 grit for the final smoothing pass, after starting at 80-120 grit if you’re removing old finish. This range smooths the surface and removes imperfections while leaving enough texture for good paint adhesion.
Should You Sand Wood Before Painting?
Yes, you should sand wood before painting. Sanding smooths the surface and removes imperfections, ensuring better paint adhesion and creating a clean, uniform base for a professional-looking finish.
What Is The Best Sandpaper For Prepping Wood?
A medium-grit sandpaper (around 80 to 120 grit) efficiently removes imperfections without excessive damage, allowing smooth, even sanding that preps the wood surface for finishing or painting.
What Grit Sandpaper Between Coats Of Paint On Wood?
Use a fine grit sandpaper, typically 240 to 320 grit, between coats of paint on wood, once the previous coat has fully cured. This creates a smooth surface for better adhesion and a professional finish without over-sanding.
Can You Sand Wood Too Smooth Before Painting?
Yes. Sanding past roughly 220-240 grit on bare wood before the first coat can polish the surface and remove the texture paint needs to grip, which can lead to peeling or poor adhesion, particularly on dense hardwoods. Stop at 220 grit for painting; save finer grits for between-coat scuff-sanding or non-paint finishes.
Conclusion
To get a smooth, flawless finish on wood before painting, use 80-120 grit to strip old finish or roughness, then step up to 150 and finish at 220 grit. Stopping at 220 — not going finer — keeps enough surface texture for paint to properly grip. Take the time to sand in the right order and you’ll avoid both a rough finish and the hidden problem of over-sanding.
