How to Refinish Furniture: Part 5 Surface Preparation
Surface Preparation: How to Get Furniture Smooth and Ready for Finish
Once the repairs are done and the old finish is removed, you’re finally getting close to the point where the furniture starts looking like something again.
But before primer, paint, stain, or clear coat goes on, there’s one more stage that can make or break the finished result:
Surface preparation.
This is where you smooth repairs, remove scratches, even out the wood, clean off sanding dust, and make sure the entire piece is ready to accept whatever finish comes next.
At Brickhouse & Baron, this is one of the stages we pay the most attention to.
Because once paint goes on, every uneven repair, deep sanding scratch, missed ridge, or rough patch suddenly becomes much easier to see.
The better the surface feels before finishing, the better the finished furniture usually looks afterward.
1. Start With the Right Sandpaper Grit
Sandpaper grit is basically a measure of how aggressive the paper is.
Lower numbers are more aggressive.
Higher numbers are finer.
A lot of people either start too rough or jump to fine sandpaper too early.
Both can create extra work.
A simple way to think about it is:
Coarse paper removes material.Medium paper shapes and smooths.Fine paper prepares the surface for finish.
60–80 Grit
This is aggressive territory.
We generally reserve grits this coarse for situations like:
Heavy damage
Thick filler
Large Bondo repairs
Removing stubborn finish from solid wood
Flattening major surface irregularities
Be careful.
These grits can leave deep scratches very quickly.
On veneer, they can also go through the surface faster than you might expect.
For most furniture, you do not need to start this low.
100–120 Grit
This is a useful range for:
Initial smoothing
Removing moderate scratches
Leveling repairs
Cleaning up stripped wood
Removing old coating residue
If you’ve done a larger repair, this is often where you start shaping it into the surrounding surface.
150–180 Grit
This is where a lot of general furniture sanding happens.
It works well for:
Smoothing previous sanding scratches
Feathering repairs
Preparing painted surfaces
General surface refinement
For many painted furniture projects, 180 grit can leave you with a very workable surface.
220 Grit
220 is useful for final smoothing before primer or between certain coats.
It’s fine enough to clean up small imperfections without aggressively reshaping the surface.
We use it often for:
Final surface prep
Lightly smoothing primer
Smoothing repaired areas
Knocking down minor texture
Higher Grits
Higher grits can be useful later in the finishing process, especially between clear coats or when trying to create an extremely smooth finish.
But you usually don’t need to sand bare wood to extremely high grits before painting.
In fact, sanding wood too smooth can sometimes reduce how evenly stain penetrates.
Use the grit that makes sense for what you’re doing.
2. Don’t Skip Grits Too Aggressively
If you start with 80 grit and jump directly to 220, you may still have deep 80-grit scratches hiding underneath.
The finer paper will smooth the tops of those scratches but may not completely remove them.
A better progression might look like:
80 → 120 → 180 → 220
Or:
120 → 180 → 220
You don’t always need every grit.
The goal is simply to remove the scratches left by the previous step.
3. Feather Your Repairs
This is especially important if you’ve used:
Wood filler
Bondo
Epoxy
Veneer patches
Edge repairs
Corner repairs
The repaired area shouldn’t feel like a separate patch sitting on top of the furniture.
It should transition smoothly into the surrounding surface.
That’s what feathering does.
How to Feather a Repair
Start on the high part of the repair.
Sand it down gradually.
As you get closer to the surrounding surface, widen your sanding area.
You’re trying to create a gradual transition instead of a sharp edge.
Run your hand across it regularly.
If you can feel where the repair starts and stops, keep refining it.
Your fingers often catch things your eyes miss.
4. Pay Attention to Edges and Corners
Edges are easy to over-sand.
Especially on veneer.
If you use a power sander, the edge of the sanding pad can remove material much faster than the center.
That means corners can become rounded, profiles can disappear, and veneer can get sanded through.
Slow down around:
Drawer edges
Tabletop edges
Decorative trim
Corners
Raised panels
Veneer edges
Sometimes hand sanding is the safer choice.
5. Raising the Grain
If you’re working with bare wood, especially before stain or a water-based finish, you may want to intentionally raise the grain.
Wood fibers can lift slightly when they absorb moisture.
If you apply your finish before dealing with that, the surface may feel rough afterward.
How to Raise the Grain
Lightly dampen the bare wood with clean water.
You do not need to soak it.
Just enough moisture to slightly raise the fibers.
Let the surface dry completely.
Then lightly sand it with a fine grit.
Usually something around 180–220 works well.
This knocks down the raised fibers before the actual finish goes on.
6. Dealing With Chemical Stripper Burns and Dark Spots
If you used chemical stripper earlier in the process, you may notice areas that look darker, rougher, or almost burned.
People often call these stripper burns, even though what you’re seeing may actually be discoloration, residue, softened finish, or a chemical reaction with the wood.
They can show up as:
Dark patches
Uneven color
Rough spots
Raised grain
Sticky areas
White haze
Softened finish residue
Don’t panic.
A lot of these can be corrected during surface preparation.
First, Make Sure the Stripper Is Completely Removed
Before sanding aggressively, make sure you’ve removed all remaining stripper and residue according to the manufacturer’s instructions.
Some products require:
Water cleanup
Mineral spirits
Another neutralizing product
A specific wash
Follow the directions for the stripper you used.
Different chemical strippers behave differently, so don’t assume the same cleanup method works for all of them.
Let the Wood Dry Completely
This is especially important.
Wood may look dry on the surface while still holding moisture or solvent deeper down.
Give it time.
Sanding wet or chemically softened wood can smear residue and make the surface worse.
Sand Lightly First
Once everything is dry, start with a moderate grit.
Something like 120 or 150 is often enough.
You’re trying to remove the damaged or raised surface fibers without unnecessarily digging into the wood.
If the discoloration is only near the surface, it may sand away fairly quickly.
If the Dark Spot Goes Deeper
Sometimes stripper or moisture can cause tannins or old stains to become more visible.
If the area stays dark after sanding, stop before you create a low spot.
At that point, you may need to:
Blend the area with the surrounding wood
Use a wood-safe stain treatment
Adjust your final stain color
Prime and paint instead
Use an appropriate wood bleaching method if the project requires it
Don’t keep sanding indefinitely trying to chase one dark mark.
Eventually you’ll change the shape of the furniture.
Watch Veneer Carefully
This is especially important on veneered tops.
If the stripper caused discoloration, don’t assume you can simply sand through it.
The veneer may only be a thin layer.
You can easily turn a minor discoloration into a much bigger repair by sanding through the veneer.
Go slowly.
What About Chemical Burns on Skin?
Chemical stripper can cause actual chemical burns.
If it gets on your skin or in your eyes, stop working and follow the first-aid instructions on the product label or Safety Data Sheet immediately.
In general, chemical exposure should be flushed promptly with plenty of water unless the product instructions specifically say otherwise, and significant exposure or ongoing pain should be evaluated medically.
The safest approach is still prevention:
Chemical-resistant gloves
Eye protection
Appropriate clothing
Proper ventilation
Furniture can be repaired.
Your skin and eyes are harder to replace.
7. Sanding After Chemical Stripping
Once stripper residue is gone and the furniture is dry, sanding becomes much easier.
You’re usually not trying to remove an entire finish anymore.
You’re cleaning up:
Residue
Raised grain
Small finish remnants
Scraper marks
Surface discoloration
Roughness
This usually means you can work with more moderate grits instead of starting extremely coarse.
8. Hand Sanding vs. Power Sanding
Power sanders save a huge amount of time.
But they aren’t always the right tool.
A random orbital sander works great on:
Tops
Sides
Large drawer fronts
Flat doors
Hand sanding works better for:
Corners
Profiles
Trim
Curves
Veneer edges
Detail areas
Use both.
Trying to force a power sander into every part of a piece usually causes damage.
9. Use a Sanding Block
For flat surfaces, a sanding block can help keep everything even.
If you just hold sandpaper in your fingers, your fingertips naturally create uneven pressure.
That can create little dips.
Wrapping the sandpaper around a flat block distributes the pressure more evenly.
It’s especially useful when feathering larger filler repairs.
10. Remove All the Sanding Dust
Once the furniture feels smooth, you still have another problem:
Dust.
And furniture sanding dust gets everywhere.
If you leave it behind, it can end up trapped underneath primer, paint, stain, or clear coat.
That gives you a rough finish.
11. Vacuum First
Our preference is usually to start with a vacuum.
A shop vacuum with a soft brush attachment works well.
Go over:
Tops
Sides
Drawer openings
Corners
Trim
Inside cabinets
Drawer boxes
You’d be surprised how much dust hides in corners.
And once you start spraying or brushing finish, that dust likes to come right back out.
12. Tack Cloth vs. Vacuum
Both can be useful, but they’re not exactly the same thing.
Vacuum
A vacuum physically removes the majority of the dust.
That’s why we like to use it first.
It works especially well for heavy sanding dust.
Tack Cloth
A tack cloth is slightly sticky and designed to pick up fine dust left behind after vacuuming.
It can be useful before finishing.
But use it lightly.
You don’t need to press hard or scrub the surface.
Some tack cloths can leave residue if overused, especially on unfinished wood.
If you’re using one, follow the product directions.
Microfiber Cloth
A clean microfiber cloth can also work well.
For some projects, we prefer it because there’s less risk of leaving a tacky residue.
The best method often depends on the finish going on afterward.
13. Don’t Blow Dust Everywhere
Compressed air can be tempting.
It gets dust out of corners quickly.
The problem is that now the dust is floating around your entire shop.
And eventually, it settles back down.
Sometimes compressed air is useful for details, but pair it with good dust collection or do it well before finishing.
Otherwise you may just be moving the problem around.
14. Wipe the Surface Appropriately
Depending on what you’re applying next, you may want to do a final wipe with the appropriate cleaner or solvent.
For example, some bare wood surfaces may be wiped with a compatible solvent before staining.
But always make sure the product you use is compatible with the finish you’re applying next.
You don’t want to leave a residue that creates an adhesion problem.
And always let the surface dry completely.
15. Do a Final Surface Inspection
This is the last chance to catch problems before finish goes on.
Take your time.
Use good lighting.
Look across the surface from an angle.
Side lighting is especially useful because it makes defects cast little shadows.
You may suddenly see:
Sanding scratches
Dents
Raised filler
Low spots
Drips from an earlier finish
Missed stripper residue
Veneer damage
Rough edges
Use Your Hands Too
Close your eyes and run your hand across the surface.
Seriously.
Your fingers can detect tiny ridges and dips better than your eyes can sometimes.
If something feels wrong now, it’s probably going to show even more once paint or clear coat goes on.
Fix it now.
16. Don’t Chase Perfection Forever
There’s also a point where you need to stop sanding.
Furniture doesn’t have to feel like glass before you prime it.
You’re looking for:
Smooth transitions
No major scratches
No raised repairs
No loose finish
No residue
No sanding dust
A consistent surface
That’s enough.
Over-sanding can create its own problems.
A Simple Surface Preparation Workflow
If you want a straightforward order, we usually recommend something like this:
Let repairs cure fully
Level filler or Bondo
Sand the furniture evenly
Feather repairs
Address stripper residue or dark spots
Raise the grain if needed
Finish with the appropriate fine grit
Vacuum thoroughly
Wipe the surface clean
Inspect with good lighting
Feel the surface by hand
Make any final corrections
Then you’re ready for primer, paint, stain, or clear coat.
The Finish Only Looks as Good as the Surface Underneath
This is the part of refinishing where patience pays off.
A lot of finish problems that look like “bad paint” are actually preparation problems.
Deep sanding scratches.
Raised filler.
Dust.
Stripper residue.
Uneven repairs.
All of those things can show through the final finish.
At Brickhouse & Baron, we’d rather spend another twenty minutes preparing the surface than spend hours fixing paint later.
Because once the prep is right, the next steps get a whole lot easier.
Keep Going With the BHB Furniture Refinishing Series
Furniture Repair
Learn how to fix loose joints, broken corners, drawer issues, veneer damage, and other structural problems before finishing.
Priming
Once the furniture is smooth and clean, primer creates the foundation for a consistent painted finish.
Painting Furniture
After the surface is properly prepared and primed, this guide covers how to apply paint evenly and avoid common finish problems.
At Brickhouse & Baron, we’ve learned that a smooth finish starts long before the paint goes on.
Take your time here.
Your future self will thank you when the final coat lays down clean.
Restore. Refinish. Rehome.
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