The Best Wood Filler

There are hundred’s of products available for filling and repairing woodwork and choosing the right one for the job can be confusing. I’m not going to pretend that I know exactly what you should be using but I am going to recommend a few products that I have used myself over the years.

There are links to online retailers although you should be able to find most of these at your local DIY store, or something very similar anyway?

Wax filler stick
Liberon Wax Filler Sticks (from amazon.co.uk)
These sticks of coloured wax are perfect for filling small nail holes in polished wood.

Just cut a small piece off and work with your hands until it starts to soften. Then push into the hole using a scraper or piece of stiff plastic.

It can take a bit of practice to get a satisfactory result but it’s a lot better than using traditional fillers and you can even mix different colours together to get a perfect match. One stick will last you a lifetime btw. Available in a range of shades, as well as white.

Small gap wood filler
Bona Gap Master (from amazon.co.uk)
I’m not a fan of ready-mixed fillers but, for narrow gaps, this cartridge stuff takes some beating.

You can get coloured sealers for sealing the tops of skirting boards and around architraves but this product has a better range of colours to match natural wood shades.

When it’s dry you can also sand it down, so it’s also suitable for filling small nail holes and such.

2 pack wood filler
Ronseal High Performance Wood Filler (from amazon.co.uk)
For filling screw holes and minor wood repairs two-pack fillers are essential; I wouldn’t recommend anything else.

This Ronseal stuff is always decent value and comes in decent sized packs – so you’ll always have enough.

If you’re not used to using this kind of filler start with a small trial first so you get used to mixing the right amounts and only mix what you can use in about 5 minutes.

Also, never try and fill first-time – build-up in 2 or 3 layers so you only have a small amount of sanding to finish it off.

If you take your time you’ll always get a good result and the filler will last for years. Available in light or dark wood shades as well as pure white.

2 pack wood filler for coloured wood
Morrells Two-Part Coloured Wood Fillers (from amazon.co.uk)
This is also a two-pack filler but comes with a greater choice of colours, which is useful if you need to match an existing finish.
wood hardener
Toupret Liquid Wood Hardener (from amazon.co.uk)
For exterior woodwork, a basic two-pack filler (as above) will usually suffice but if you’re dealing with damaged timber you might need to do a bit of preparation first.

This stuff will bind together loose fibres of wood to give your repair the best chance of success and is essential if you’ve had to remove pieces of damp timber.

It’s expensive but if your only other option is the replacement of windows, for example, it is well worth it.

Exterior wood filler
Toupret Extrem’ Wood Repair Filler (from amazon.co.uk)
Again, you could use a cheaper brand of filler for most exterior repairs but if you need to know you’re using the best stuff available, this is it.

All of these fillers, except for the wax sticks, are suitable for painting or staining without the need for a primer.

For most wood filling jobs, one of these products should be all you need. You’ll see a variety of different brands which all do more or less the same thing and there isn’t really much between them.

The only products I would avoid for filling wood are powder based products such as Polyfilla, which are fine for walls and ceilings, but definitely not for wood.

Comments

Dow – Do commercial 2-part wood-fillers work any better than DIY ones? I had extensive rot in a window-cill, which I filled with 2-part wood-filler some 40 years ago. It looked immaculate when I’d finished – but within a year, the filler had separated from the remaining timber, and I had to dig it out. I re-did it with Dulux Weathershield Flexible filler, and whilst that wasn’t nearly as easy to work with, it is still completely intact 40 years later. A year ago, I found a long strip of rot running parallel to the edge of another cill. I dug it out, and this time tried Ronseal High Performance 2- part filler. I added some small stainless-steel screws to provide additional keys for the filler. Gallingly, within 6 months, cracks started to appear between the filler and the timber, and it’s now apparent that I’ll need to re-do the repair. I suspect the problem is that epoxy- or polyester-type fillers just can’t match the flexibility of the timber. I treated the remaining timber with wood preservative before filling, and although I left it for some time to soak in, it may also be that that impairs adhesion between the timber and the filler. READ MORE…

There are so many variables that is impossible to offer a definitive solution. Much depends on the state and type of timber affected and what works perfectly in one situation may fail hopelessly in another.

2-part fillers do cure very hard though and offer little resistance to natural expansion and shrinkage. Single part, ready-mixed fillers such as Dulux Weathershield do not fully cure and, consequently, remain flexible for much longer.

You may get slightly better adhesion if you use a primer or sealer beforehand and allow a couple of days for it to fully cure before filling.

Susan – Hi there. I’m looking for a wood gap filler for the edge of an oak floor in a neutral/natural colour, ideally with a greyish tinge. Everything I’ve seen/bought is really orange/yellow. Can you suggest anything? READ MORE…

Darren – Bona Gap Master offers the best range of colours although you never get the perfect match. It’s one of those things that requires a bit of trial and error.

More details here and colour options here…
https://www1.bona.com/en-gb/webchannel/professional/coatings/fillers/

Stan – Filler required for an external Oval wooden arch that I made, problem I need to fill joins and imperfections. Last year I filled with ronseal two part that I have used for many years, but sun then weather has made cracks show and split . Is there a wood filler to better ronseal two part. READ MORE…

If the splits and cracks are a result of natural movement you’d need to use a more flexible filler. Two-pack epoxy fillers are great but they don’t allow for much movement when cured. Ready-mixed fillers tend to perform better since they don’t dry so hard and retain a little flexibility.

Chris – I am painting exterior wood. I have had to fill certain areas with wood filler. What is the best way to cover and blend in the filler? I am using wood stain, mahogany colour. READ MORE…

Darren – You can paint the areas where the filler is a light terracotta colour and then overcoat with wood-stain. This will give a half-decent match although with a bit of trial and error with the base coat colour you could get it near perfect.