Wood filler for floors is important, as it fills cracks or holes which naturally occur in wood floors once they have been laid down. Wood is a naturally porous building material, so over time or even shortly after construction of the floor, wood filler should be used to fill these holes before finish and lacquer is applied. It's important to find a good wood filler, which can properly fill the holes and not crumble over time and with use.
Lacquer Wood Floor Filler
The most commonly used wood floor filler is laquer wood floor filler, as it is easy to apply and sand down. The lacquer wood filler works with all types of wood colors and has been modified to match all types of woods, even imported woods from around the world. It is a mix of lacquer and wood flour and not only fills holes but also finishes and protects the wood from water, Most good lacquer fillers come premixed and ready to use, though a couple of colors come in powder form and must be mixed before they are used. The filler can be thinned out a bit by adding more water to it, but this isn't necessarily a good idea, as it can then break down more easily over time. Two or three coats are usually needed with lacquer wood floor filler.
Wood putty is widely used on wood floors to fill gaps and cracks, as it is easy to use and apply and isn't very expensive. It can be applied to the gaps and cracks with a putty knife or even with your fingers, sweeping it over the crack to ensure the crack is well filled. After a few moments, wipe the excess putty off with a rag and move on to the next crack or hole that needs to be filled. When the putty dries, it will expand and fill those holes in the wood almost seamlessly. However, wood putty isn't very good for larger holes in the wood, as it will dry too quickly and just crumble away. Store the wood putty in a cool, dark place with the top firmly affixed, so that it doesn't dry out.
No-wax finish should be applied when the floor is first built and works as a lacquer and a filler for all wood floors. Filling certain cracks with wood putty first might be a good idea; the no-wax finish will lock the putty in place. The no-wax finish will need touch-ups and regular cleaning, but no filler maintenance will be needed if the finish is properly applied to a good hardwood floor. After five to ten years, it might be necessary to reapply a finish or check for a few places to apply it, but the no-wax finish should eliminate any wood-filling worries until then.