"Which steel wool do I need?" is one of the most common questions when someone is about to oil a worktop or degloss a lacquered surface. The answer depends entirely on the grade — and the steel wool scale isn't obvious: it runs from 0000 (finest) to 4 (coarsest), and more zeros mean finer wool. This guide walks through the whole scale, which grade to choose for oil, wax, deglossing, rust and paint removal — plus the important warning about oak and water-based lacquer.
Quick answer — grade by task
| Task | Coarseness | Trollull grade |
|---|---|---|
| Buff in the final oil / wax coat | Superfine | 0000 |
| Degloss between lacquer coats | Superfine–fine | 0000 → 00 |
| Clean metal, remove water marks | Fine | 00 |
| Light rust, cutting back an old finish | Coarse | 3 |
| Remove flaking paint, heavy rust | Coarsest | 4 |
The Trollull range at Ernst P covers 0000, 00, 3 and 4 — the finishing end and the coarse end of the scale, which is enough for almost all woodworking and finishing jobs.
How the steel wool grading scale works
Steel wool is graded on a scale that can feel back-to-front the first time:
Finest → coarsest: 0000 → 000 → 00 → 0 → 1 → 2 → 3 → 4
At the fine end, coarseness is counted in zeros — the more zeros, the finer the wool. 0000 (said "four-aught") is the finest, soft almost like felted thread. When the zeros run out, the scale continues with ordinary numbers, where 4 is the coarsest and hardest wool.
Think of it as the inverse of the sandpaper grit scale: high P-numbers on sandpaper = fine, many zeros on steel wool = fine.
Grade by grade — what each is for
Steel wool 0000 — finishing, oil and wax
The most-used grade in a workshop. 0000 is the finishing wool:
- Buff the final coat of hard wax oil or finishing oil to an even, silky-matt surface
- Degloss (knock back) a lacquered surface before the next coat so it bonds
- Polish metal, clean up brass, remove light water rings on a table
- Clean glass and polish window hardware without scratching
It keys the surface so little that it rarely leaves visible scratches in wood — but always work along the grain with light pressure.
Steel wool 00 — medium-fine cleaning
One step coarser. 00 is for when 0000 is too soft but you still want a fine finish:
- Cleaning metal with a bit more bite
- Removing stubborn water marks and light surface grime
- Cutting back a glossy surface before repainting
Steel wool 3 — heavy work
Now we're into material removal. Grade 3 bites into:
- Light to medium rust on tools and hardware
- Cutting back old, hardened oil or wax finishes
- Coarse cleaning of dirty or weathered wood
Steel wool 4 — coarsest
The hardest grade, for the toughest jobs. Grade 4 tackles:
- Flaking old paint
- Heavy rust (with white spirit or a rust remover)
- Hard-set deposits on metal
After grade 3–4, always step back down (00, then 0000) to even out the coarse work before finishing.
Important: steel wool, oak and water-based lacquer
This is the mistake that ruins more oak projects than any other: steel wool particles react with the tannins in oak, walnut, chestnut and other tannin-rich timbers. Tiny metal fragments left in the pores oxidise and form black iron stains — especially under a water-based lacquer or oil that carries moisture down into the pores.
Do this instead on tannin-rich wood with a water-based finish:
- Use bronze wool (doesn't rust, doesn't react with tannin), or
- A synthetic abrasive pad of the Scotch-Brite type
On already-oiled oak with a solvent-based oil the risk is low — but always vacuum thoroughly so no fibres are left behind. As a rule of thumb: once moisture and tannin are in play, keep the steel wool away.
Steel wool or sandpaper?
They do different jobs and don't replace each other:
| Sandpaper / abrasive mesh | Steel wool | |
|---|---|---|
| Form | Flat backing, sharp grit | Flexible metal fibres |
| Removes | Material, flatly and efficiently | Little material, abrades gently |
| Best for | Levelling, working down through grits | Polishing, deglossing, rounded forms |
| Oil/wax | Less suitable | Ideal for buffing in |
| Dust | Works with extraction | No fine dust, but loose fibres |
In practice: sandpaper shapes, steel wool finishes. You level the surface with sandpaper (see our sandpaper grit guide) and then buff the oil in with 0000 steel wool.
Common mistakes
Mistake 1: Too coarse on the finishing surface
Grade 3 where 0000 should have been used leaves scratches that only show once the oil has dried. Always start fine on visible surfaces — you can go coarser if needed.
Mistake 2: Steel wool on oak under water-based lacquer
Black tannin stains (see above). Use bronze wool or a synthetic pad.
Mistake 3: Storing the wool damp
Steel wool rusts — a damp pack becomes useless. Store it dry and discard discoloured wool.
Mistake 4: Throwing oily steel wool in a pile
Steel wool soaked in oil can self-combust just like oily rags, and the fine fibres ignite easily. Soak it in water or burn it off in a controlled way outdoors.
Which one should you buy?
- Oiling or waxing wood? Steel wool 0000 — you'll almost always need it.
- Polishing metal or deglossing lacquer? 0000 for fine, 00 for a little more bite.
- Removing rust or paint? 3 for medium, 4 for the heaviest — and follow up with 0000 for the finish.
A good basic kit for a home workshop is 0000 + 3: the finishing end and the coarse end cover most jobs.
Related
- Hard wax oil — the complete guide — where 0000 steel wool buffs in the final coat
- Sandpaper grits in the right order — sandpaper shapes, steel wool finishes
- See the full wood-finishing range
Sources
Last updated 2026-06-16.
- TROLLULL — Steel Wool range 0000, 00, 3, 4. Grade designations per the manufacturer's own product names (verified against the Ernst P range).
- General finishing knowledge (industry standard): the steel wool zero scale (0000 finest → 4 coarsest), use cases per grade, and the tannin/iron-stain reaction on oak under a water-based finish. Standard wood-finishing knowledge — to be sanity-checked with Ernst P's workshop specialists before publishing.
Buff in the final oil coat with 0000 steel wool
Prepare the surface
The surface should be clean, dry and already have its oil coats. Vacuum and wipe with a lightly damp cloth, then let it dry.
Apply a thin final oil coat
Brush on a very thin coat of hard wax oil or finishing oil along the grain.
Buff in with 0000 steel wool
Tear off a piece of 0000 steel wool, fold it into a pad and buff the oil in with light pressure along the grain while the surface is still wet. The wool levels the oil and produces a silky-matt finish.
Wipe off the excess
Wait 10–15 minutes and wipe off all visible excess with a clean cloth. The surface should feel damp but not wet.
Let it cure
Let the surface cure as per the oil's instructions before use. Dispose of used oil and steel wool safely — oily rags can self-combust.
Vanliga frågor
What does 0000 mean on steel wool?
Steel wool is graded on a scale where more zeros mean finer wool. 0000 (said "four-aught") is the finest grade — soft, almost like fine thread — and is used for polishing, the final coat of oil and for deglossing. The scale then gets coarser through 000, 00, 0 and on to the numbers 1, 2, 3 and 4, where 4 is the coarsest. Trollull sells 0000, 00, 3 and 4.
Which steel wool do you use with hard wax oil and finishing oils?
Grade 0000. It is fine enough not to scratch the wood but still keys the surface very slightly so the oil bonds, and it is mainly used to buff the final oil or wax coat to an even, silky-matt finish. Use it dry, with light pressure, along the grain.
Which steel wool removes rust and old paint?
Coarse steel wool, grade 3 or 4. It bites into rust, flaking paint and hardened grime on metal and wood. Work with white spirit or a rust remover for rust, and wipe clean immediately afterwards. For a finer finish, step down to 00 or 0000.
Can you use steel wool on oak?
Be careful. Steel wool particles left in the pores react with the tannins in oak, walnut and other tannin-rich timbers — especially under a water-based lacquer or oil — and cause black iron stains. Use bronze wool or a synthetic abrasive pad (Scotch-Brite type) on oak when a water-based finish is going on. On already-oiled oak with a solvent-based oil the risk is low.
Steel wool or sandpaper — what is the difference?
Sandpaper has sharp grit on a flat backing and removes material flatly and efficiently — best for levelling surfaces and working down through grades. Steel wool is made of thin, flexible metal fibres that follow the shape and abrade gently — best for polishing, deglossing lacquer, rounded details and applying or buffing oil and wax. They complement each other: sandpaper to shape, steel wool to finish.
How do I store steel wool so it doesn't rust?
Keep it dry. Steel wool is just steel and rusts quickly if it gets damp — an opened pack in a humid garage can be rust-affected within weeks. Store it in a sealed bag or tin, and throw away any wool that starts to discolour, as rust particles otherwise smear onto pale wood.