Bona Gap Master Filler

Bona Gap Master can be used to fill gaps between a variety of interior wooden surfaces including floorboards and skirting boards, prior to overcoating with a wood primer, varnish or wood oil.

Coverage is dependent on gap width and depth.

The table below gives coverage guidelines per tube:

Please note: Larger gaps may require packing with rope or cord to prevent the Gap Master from simply falling through the gap. The Gap Master is then used to fill the gap between the cord and the surface of the floor.

• For filling holes, splits and cracks in floor boards and other interior timber, we recommend Bona Mix and Fill or Bona Mix and Fill Plus
• Looking for an adhesive for fixing hollow spots, skirting boards or floor repairs? Try Bona Vertical

Ensure that surfaces to be treated are clean, dry and free from any dust, dirt or other surface contaminants. Wider gaps in floors may require rope, foam backing rod or other methods to prevent the filler from falling through the gap during application.

Always do a test area first and read the manufacturer's instructions on the tube. Do not apply if risk of rain or frost. For the best results, application temperature should be above: 13°C.

1. Cut the dome seal of the tube with a sharp knife, taking care not to damage the thread
2. Screw the nozzle on to the tube
3. Cut the nozzle at an angle to suite the size and shape of the gap to be filled
4. Slowly squeeze the mastic gun trigger to start the flow from the nozzle
5. Apply as a continuous bead ensuring contact is made with all surfaces of the gap
6. Immediately smooth the bead with a flat edge, sponge or wet finger
7. Allow 24 hours to dry, then lightly sand the surface

Please note: When fully dry and ready for sanding, it is best done using a fine abrasive by hand or using hand tools that can be run at a slow speed. This is because Bona Gap Master is designed to remain flexible. This is an excellent property for use with a material like wood, which expands and contracts. This flexibility makes it difficult to sand when it is very soft (insufficiently dry) or a too-aggressive sanding method is used. Wider, deeper gaps will require longer to fully dry prior to sanding.

Once dry and sanded as required, Bona Gap Master can be overcoated with a range of Bona Wood Primers, Bona Wood Varnishes or Bona Wood Oils.

Bona Gap Master is perfect for filling and sealing the gap under skirting board edges or between skirting boards and walls. It's flexible so can move with the wood of the floor and skirting boards, can be sanded smooth when fully dry and is available in a range of colours to blend in with pre or previously finished floors, skirting boards and walls. This makes it the ideal choice as a skirting board filler.

Colours can be difficult when looking at screens. You can get in touch by calling us on 01303 213838 and we can send a real life photograph of the colours next to each other so you can get a better understanding of how they appear.