Filling Dents in Timber Furniture
How do you fill dents in timber furniture?
Dents and cracks in timber furniture do not mean the piece is destined for the tip. With Selleys No More Cracks Wood Filler and four steps, the furniture can look as good as new. The job takes 2 to 3 hours, and almost all of that is drying time rather than work.
The reason this repair often disappoints is not the filler — it is the finish. A filled dent is invisible in bare timber and obvious once paint or varnish goes over it, because the filler and the surrounding wood take a coating differently. Working through the finishing note at the end of this guide is what separates a repair you can see from one you cannot.
What you need
- Selleys No More Cracks Wood Filler
- A filling blade or scraper
- 240 grit sandpaper
- A water-based undercoat, if you are painting
How to fill dents in timber furniture
- Make sure the surface to be filled is clean, dry and free of loose or powdery material.
- Use a filling blade or scraper to firmly press Selleys No More Cracks Wood Filler into the dent. Scrape off any excess to save time sanding later.
- Allow to dry for 2–3 hours.
- Sand lightly with fine sandpaper.
- Paint or varnish to finish. Apply a water-based undercoat before you paint for the best results.
Why each step matters
Clean, dry and free of loose material
Filler bonds to what it touches. A dent in old furniture usually has a rim of loose fibres pushed up around it and a layer of polish or wax inside it, and filler applied over either of those will pop out later as a neat plug. Scrape or sand the loose material away, and if the piece has been polished, clean it with Sugar Soap before you start.
Press it in firmly
"Firmly press" is doing real work in that instruction. Filler dragged lightly across a dent bridges it, leaving a void underneath that collapses when you sand. Pressing forces the material into the bottom of the dent and against its walls, and that is what makes the repair hold.
Scraping off the excess as you go is worth the extra few seconds. Sanding cured filler off a surrounding surface takes far longer than scraping it while it is soft, and it is easy to sand through the timber's own surface in the process.
Two to three hours, and what depth that assumes
The 2–3 hour figure matches the technical data sheet's drying time for a 2mm thickness at 25°C. The full published figures are:
| Fill thickness | Drying time at 25°C |
|---|---|
| 1mm | 1–2 hours |
| 2mm | 2–3 hours |
| Thicker than 2mm | Substantially longer |
Two things follow from that. Drying times are dependent on humidity, so a damp day or a closed-up room extends them. And for anything deeper than 2mm — a proper gouge rather than a dent — the right approach is several thin coats, letting each dry before the next, rather than one deep fill. A deep single fill skins over on top and stays soft underneath, which sands beautifully and then sinks a week later.
Figures are from the product's technical data sheet and are indicative results rather than a basis for preparing specifications.
Sand lightly, with 240 grit
The filler is easy to sand, which is a virtue and a trap. Light pressure and fine paper level the repair without cutting into the timber around it, which would turn a small dent into a shallow saucer. Sand until the filler is flush, then stop — checking by running a fingertip over it rather than by eye, because your finger will find a step your eye misses.
Finishing: the undercoat matters
Apply a water-based undercoat before you paint. The reason is that filler and timber absorb differently: paint straight onto the repair sinks in at a different rate to the paint beside it, and the patch shows through as a dull or glossy spot even when the colour matches exactly. An undercoat equalises the surface so the topcoat sits the same everywhere.
The filler is also stainable, if you would rather keep the timber natural. One thing to know before you judge the colour: when tinting or staining, the final colour is not achieved until the varnish is applied, so a stained repair that looks wrong before varnishing may well be right afterwards. Test on an offcut if you can.
Uncured filler cleans up with water.
Limitations — where this repair is not the answer
- Interior use. No More Cracks Interior Wood Filler is for interior timber. For outdoor furniture, decking or exterior joinery, use No More Cracks Exterior Wood Filler.
- Not for joints that move. Filling the gap where a leg meets a rail hides a loose joint rather than fixing it, and the filler will crack out the first time the joint works. Re-glue the joint instead — see how to restore a mid-century chair.
- Not structural. Filler restores appearance; it does not restore strength. A cracked chair rail needs to be glued or replaced.
- Depth limits per coat. Beyond 2mm, build up in layers rather than filling in one pass.
Choosing between the fillers
| Product | Best for | Notes |
|---|---|---|
| No More Cracks Interior Wood Filler | Dents, small holes and cracks in interior timber | Water-based, easy to sand, paintable and stainable, water clean-up |
| Plastic Wood | Interior woodwork repairs | Fast-acting solvent-based filling cement; stir thoroughly and slightly overfill deep holes to allow for sanding |
| Knead It Multipurpose | Rebuilding a missing corner or edge | Epoxy putty; sandable at 60 minutes, full cure 24 hours; cures very hard and is not for joints that move |
| No More Cracks Exterior Wood Filler | Outdoor timber | The exterior grade of the same range |
Safety: the cleaning step and the putty are the two to watch
Selleys Sugar Soap is classified Danger — H318, causes serious eye damage (Category 1). Knead It Multipurpose is classified Warning, with skin sensitisation at Category 1A — may cause an allergic skin reaction — plus skin irritation and serious eye irritation. The fillers themselves are milder: No More Cracks Exterior Wood Filler carries Warning — H317, and the interior grade is not classified as hazardous at all, though its safety sheet notes it contains isothiazolinone preservatives and that repeated contact may cause sensitisation.
Cleaning a polished piece is the high-exposure moment for the cleaner. Wax and old polish do not lift in a weak bucket mix, so this is precisely the job where people reach for the concentrate on a cloth — and the concentrate is what the H318 classification belongs to. Category 1 is permanent damage rather than a sting; the safety data sheet for the concentrate describes corneal burns. You are usually working at bench height on a piece tipped on its side, wiping toward yourself. Eye protection for the wipe-down, gloves for handling the bottle, and dilute it if the finish will let you.
Knead It is the product here that most invites bare hands and least tolerates them. It is a two-part epoxy putty designed to be kneaded until the colour runs uniform, and fingers do that better than anything else. Category 1A skin sensitisation is the sub-category used where there is strong evidence of sensitising humans. It is generally permanent once acquired, and thereafter a much smaller contact sets off the reaction. If a corner is missing and you are rebuilding the shape with putty rather than filling a dent, put gloves on before you cut the stick — kneading epoxy bare-handed is the most common way a home woodworker acquires a permanent epoxy allergy.
For a plain dent, the interior wood filler is the lowest-hazard option on this page, and it is what most furniture repairs actually need. Keep the putty for the jobs a filler genuinely cannot do.
Poisons Information Centre — 131 126 in Australia, 0800 764 766 in New Zealand.
Common questions about filling dents in timber
How long does wood filler take to dry?
Two to three hours for a 2mm fill at 25°C, and one to two hours at 1mm. Anything thicker than 2mm takes substantially longer, and humidity extends all of these.
Can I fill a deep gouge in one go?
Better not to. Build it up in layers of 2mm or less, letting each dry before the next, or the fill skins over and stays soft underneath.
What grit sandpaper should I use?
240 grit. Sand lightly — the filler sands easily and it is simple to cut into the timber around the repair.
Can I paint over it?
Yes. Apply a water-based undercoat first, so the repair and the surrounding timber take the topcoat evenly.
Can I stain it?
Yes, the filler is stainable. Note that the final colour is not achieved until the varnish is applied, so judge it after varnishing rather than before.
Why does my repair still show after painting?
Usually because there was no undercoat. Filler and timber absorb paint differently and the patch reads as a dull or shiny spot even when the colour matches.
Do I need to clean the dent first?
Yes — clean, dry and free of loose or powdery material. Old polish or wax in the dent will stop the filler bonding.
How do I clean up the excess?
Scrape it off while it is soft to save sanding later, and clean tools with water.
Can I use it outdoors?
No — this is the interior grade. Use No More Cracks Exterior Wood Filler for outdoor timber.
Will it fix a wobbly joint?
No. Filling a moving joint hides the problem and the filler will crack out. Re-glue the joint properly instead.
How long does the whole job take?
About 2 to 3 hours, nearly all of it drying time.
What if a whole corner is missing rather than dented?
Use an epoxy putty such as Knead It Multipurpose, which can be moulded to shape and is sandable after 60 minutes.
What Selleys product is recommended for filling dents in interior timber furniture?
Selleys No More Cracks Wood Filler Interior is recommended for filling dents in interior timber furniture. It is a ready-to-use product specifically formulated for interior timber applications.
What are the key advantages of Selleys No More Cracks Wood Filler Interior?
Its key advantages include being stainable and paintable to match the furniture's finish, providing a durable finish that withstands regular use, being easy to sand smooth once dry, and offering excellent adhesion for a long-lasting repair.
Is there another Selleys product for filling small cracks and dents in timber furniture?
Yes, Selleys No More Cracks RTU Cracks & Dents is another ready-to-use option designed specifically for filling small cracks and dents, and it comes in multiple sizes: 350g, 520g, 750g, and 1.6kg.
How should I prepare a timber surface before filling a dent?
The surface should be clean and dry with no loose or powdery material before applying the filler.
What tool should be used to apply the wood filler into a dent?
A filling blade or scraper should be used to firmly press the filler into the dented area and scrape off excess material to minimize sanding.
How long does the wood filler take to dry before sanding?
The filler should be allowed to dry for 2-3 hours, though drying time depends on humidity levels.
What should I do after the wood filler has dried?
Once dried, sand the filler with fine sandpaper to achieve a smooth surface that is flush with the surrounding timber.
How can I achieve a perfect finish when repairing a larger dent?
For a perfect finish, you can apply a second thin coat of filler, allow it to dry completely, then sand lightly with very fine sandpaper.
What can be done once the filler is sanded smooth?
Once the filler is sanded smooth, you can apply your desired finish to the timber furniture.