Best Sandpaper Grit for Wall Filler (And When to Use Each One)

If your filler repair still shows after painting…

There’s a good chance the problem wasn’t the filler.

👉 It was the sanding.

A lot of people think sanding is just rubbing the patch until it feels smooth.

It isn’t.

The grit you use changes everything:

• How fast filler comes down

• How well edges feather

• How smooth the repair looks after paint

And using the wrong grit can leave scratches, flat spots… or a repair that flashes through your finish coat.

So what’s the best sandpaper grit for wall filler?

Truth is—

👉 It isn’t one grit.

It’s a sequence.

And that’s where good repairs separate from average ones.

Start With This Rule

Different grits do different jobs.

You shouldn’t use one grit for everything.

The best finish comes from using a range of grits, moving from shaping… to refining… to finishing.

That’s how decorators do it.

80 Grit — The Best All-Rounder Grit Sandpaper

If I had to carry one grit for filler work—

👉 80 grit is the universal choice.

Why?

Because it has the best balance of:

• Abrasion

• Control

• Feathering ability

It removes filler efficiently…

But still lets you blend edges into the wall nicely.

That’s why it’s such a go-to.

Good for:

✔ General filler sanding✔ Shaping patches✔ Feathering edges✔ Bringing down slight high spots

If you only own one grit—

Make it 80.

120 Grit — Better Finish, Less Cutting Power

This is where you refine the repair.

120 grit still has some bite…

But gives a much cleaner transition from filler to wall.

👉 It’s excellent for feathering.

This is why so many tradespeople carry 80 and 120 grit together.

Shape with 80.

Finish with 120.

Simple system.

Best for:

✔ Final shaping✔ Blending edges✔ Preparing for paint

Not ideal for:

Deep or heavy filler buildup.

It clogs faster…

And won’t take off much material.

You’ll be there all day.

60 Grit — For Heavy Filling Only

Now we’re getting aggressive.

60 grit is coarse.

Very coarse.

But if you’ve got a deep patch or proud filler that needs bringing down fast—

👉 This is the one.

It removes material quickly.

But it is not delicate.

And it will leave scratches.

That’s normal.

You’d always follow it with finer grits afterwards.

Use 60 grit when:

• Filler is too proud

• Deep patches need knocking back

• Heavy shaping is needed

Then move up to 80 and 120.

Never stop at 60.

240 Grit — For That Last Professional Finish

This isn’t shaping paper.

This is finishing paper.

And it’s what a lot of decorators use for that extra level of finish.

👉 240 grit doesn’t remove much filler at all.

That’s the point.

It refines.

Polishes.

Smooths.

Perfect for final passes before painting.

Great for:

✔ Final finish sanding✔ Removing minor scratches✔ Ultra-smooth repairs before paint

Not for:

Deep fills.

At all.

It’ll barely touch them.

The Sanding Progression That Works

This is a very solid system:

For standard repairs:

• 80 grit to shape

• 120 grit to refine

Done.

For a decorator-level finish:

• 80 grit

• 120 grit

• 240 grit final pass

That extra step shows after painting.

Don’t Sand With Paper In Your Hand

This is a big one.

And people do it constantly.

Holding paper in your fingers creates pressure points.

Your fingertips dig in.

And suddenly:

👉 Your “flat repair” isn’t flat anymore.

It’s wavy.

Bumpy.

Uneven.

Use:

• A sanding block

• Pole sander

• Or sanding machine

Anything that keeps the surface flat.

Flat sanding = flat repairs.

Simple.

Don’t Skip Priming the Filler

This gets missed all the time.

The repair is sanded smooth…

Looks perfect…

And then after painting—

👉 You can still see the patch.

That’s usually flashing.

Some fillers absorb paint differently from the surrounding wall, so even a good repair can grin through the finish.

Especially under light.

The fix?

Prime the filler before your finish coats.

Always.

A quick coat of primer or suitable undercoat helps:

• Seal the filler

• Even out porosity

• Stop flashing

• Help the topcoat dry uniformly

👉 Some fillers need this more than others, but as a rule, it’s good practice on all repairs.

Because a repair can be perfectly filled and sanded…

And still show through paint if it hasn’t been sealed first.

And after all that work—

That’s frustrating.

Why Sandpaper Choice Matters So Much

Bad grit choice causes:

• Visible repair edges

• Scratches under paint

• Flashing

• Bumpy patches

• Over-sanded areas

And people blame the filler.

It wasn’t the filler.

It was the sanding.

What Most Trades Carry

Most decorators I know carry:

✔ 80 grit✔ 120 grit

That covers most repairs.

Some go one step further—

And keep 240 grit for final finishing.

And honestly…

That extra step often makes the difference.

So What’s the Best Sandpaper Grit for Wall Filler?

If you want one answer:

👉 80 grit is the best all-rounder.

But the best finish?

Use more than one grit.

Shape.

Refine.

Finish.

That’s how you get repairs that disappear.

🔚 Final Thought

Good filler repairs aren’t made when you apply the filler.

They’re made when you sand it.

Use the wrong grit—

And even good filling can look poor.

Use the right grits in the right order…

Prime the repair before painting…

And the patch disappears.

That’s the goal.

❓FAQ: Sandpaper Grit for Wall Filler

Is 80 grit too rough for wall filler?

No — it’s one of the best all-round grits for shaping and feathering filler.

Is 120 grit better than 80 grit?

For finishing and blending edges, yes.

For heavy sanding, no.

They do different jobs.

Should I use 240 grit on filler?

Yes — as a finishing grit.

Not for shaping.

What grit removes filler fastest?

60 grit.

Very aggressive, best for deep patches.

What grit do decorators use on filler?

Often 80 and 120 grit as standard, with 240 grit for final finishing.

Should I sand filler by hand?

Better to use a sanding block or machine for a flatter finish.

Can coarse sandpaper scratch filler?

Yes. 60 grit especially can leave scratches, which is why it should be followed with finer grits.

Should I prime filler before painting?

Yes — especially if you want to stop flashing or patch repairs grinning through the paint.