Junckers SB Filler (was Junckers Basefill) is a quick-drying solvent-based filler, perfect for filling larger gaps. Fill gaps of up to 2mm by mixing SB Filler with the sawdust created from sanding the floor prior to applying a finishing coat using Junckers Rustic Oil or Junckers oil-based or water-based lacquers. This product is suitable for sanded and untreated floors, including most exotic wooden floors, and is for professional use only.