Wood Fillers

Wood fillers are used to repair defects in timber surfaces, including knots, cracks, voids, pin holes, and surface damage, before sanding and finishing. Choosing the right filler depends on the size and type of the defect, the finish you plan to apply, and whether the repair needs to be sanded, stained, or painted over. Hammer Roo stocks both hot-melt and cold-application wood filler systems to cover most repair scenarios.

Hammer Roo stocks the Wood Repair brand Thermelt hot-melt knot filler system in industrial and compact bag sizes, the E800 Aqua+ Paste Filler for cold-application repairs, and Mohawk wax fill stick kits (check current availability). Accessories including cutting tools, cooling bricks, replacement nozzles, and a saver tool are also stocked to support the Thermelt system.

Thermelt is a hot-melt filler system that uses solid filler sticks heated by a specialised applicator to inject filler into knots, voids, and cracks in timber. The filler sets quickly as it cools, can be trimmed flush using a cutting tool, and produces a hard, stable repair that takes stain and clear finishes well. It is widely used in timber flooring, furniture manufacturing, and joinery production for its speed and consistency across large volumes of material.

Yes, but the right filler choice matters. Water-based fillers like E800 Aqua+ are generally compatible with oil and hardwax oil finishes, though testing on a small inconspicuous area first is always recommended, as some fillers affect how the oil absorbs into the surrounding timber. Hot-melt fillers like Thermelt tend to be stable under penetrating oil finishes and are commonly used in timber floor finishing specifically for this reason.

E800 Aqua+ is a water-based paste filler for cold application, you press or knife it into defects, allow it to dry, then sand it flush. It is suited to filling small voids, cracks, and surface imperfections in timber and MDF before sanding and applying a finish. Being water-based, it is compatible with most water-based coating systems, produces minimal odour compared to solvent-based alternatives, and is easy to clean up.