Wood Floor Filler for Gaps & Joints

Wood floor filler closes the gaps and open joints that would otherwise trap dirt and show through a new finish. On a sanding job it goes in after the coarse sanding and before the final fine sand, so the filled joints finish flush with the boards. This collection holds the Berger-Seidle AquaSeal fillers we stock for timber and parquet floors: water-based Pafuki, pre-coloured PafukiPowder, permanently elastic PAK-Stop and acrylic FlexFill, plus a hard wax repair kit for finished floors. They suit floor sanders and serious DIY renovators, and the right choice comes down to two questions: how wide are the gaps, and will the boards keep moving?

How to choose a wood floor filler

• Hairline gaps up to 2 mm: AquaSeal Pafuki is a water-based, solvent-free filler solution mixed with fine sanding dust from the floor itself, ideally from 80 grit, for a close colour match. Spread it quickly and evenly over the floor with a trowel and sand once fully dry, under normal conditions after about 30 to 45 minutes.
• Pre-coloured, no sanding dust: AquaSeal PafukiPowder comes in seven shades, including white and black, and is mixed with water, not sanding dust. It is typically ready to sand in 20 to 30 minutes.
• Wide joints and movement gaps: AquaSeal PAK-Stop is a permanently high-elastic trowel filler, coloured and hardened by mixing in PafukiPowder. The PAK-Stop and PafukiPowder kit is pre-measured at a 30% mix ratio. Allow a minimum of 16 hours before sanding.
• Edge gaps and individual joints: AquaSeal FlexFill is an elastic, silicone-free acrylic filler in a 310 ml cartridge, sold in ready-to-use colours for gaps in the floor surface and edge areas. The FlexFill Systainer set includes a systainer case with an insert for 18 cartridges, a cartridge press and a spray bottle, supplied without cartridges.
• Chips and scratches in a finished floor: the Premium Wood Repair Kit uses melted hard wax sticks in assorted shades for spot repairs to chips, scratches, pressure marks and small holes on lacquered floors.

Board movement matters. Our Baltic pine flooring guide notes that gaps develop between boards with seasonal movement and recommends flexible fillers over rigid putty. The floor sanding grit guide sets out a grit sequence for Australian hardwood floors, from the first coarse pass to the final screen.

Once the filler is sanded back, the floor is ready for primer and finish from our timber floor lacquer range. EcoGrit ships Australia-wide from Knoxfield, Melbourne, with trade pricing for flooring professionals. Not sure which filler suits your gaps? Call our technical line on 0401 270 818.