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Boss High Density Filler 1L

Original price was: $28.00.Current price is: $26.00. ex GST

Boss High Density Filler 1L is an easy-to-use filler designed for interior and exterior use.

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Boss High Density Filler 1L is an easy-to-use filler designed for interior and exterior use. The non-toxic single pack formula is environmentally friendly and makes it ideal for use in residential applications. Suitable for repairing imperfections in a variety of interior and exterior applications.


  • Fast dry and non shrinking
  • Interior and exterior
  • Paintable and stainable
  • Excellent adhesion to a variety of substrates
  • Super smooth finish and minimal slumping
  • Long-lasting resistance to mildew and organic growth
  • Easy sanding and excellent faring properties
  • Minimal flashing
  • Clean up with water

Substrate Preparation:

All substrates must be dry and free from dust, dirt, mold and other contaminants which may affect adhesion. Exterior timber and fibre cement cavities should be primed prior to filling for best results. Concrete cavities should be sealed prior to filling with a quality concrete sealer to prevent efflorescence and lime leaching.

Directions for Use:

Apply Boss High Density Filler with a narrow filling blade. Take care to leave minimal excess filler around the hole and allow to dry. Ensure full cure has been reached prior to sanding and painting. Sand with 180 grit or finer sandpaper, remove dust, and prime with a quality water or oil based primer undercoat followed by a quality top coat. Do not allow prolonged exposure to sun or rain.


Fills holes and imperfections in:

  • Timber and fibre cement weatherboards and claddings
  • Timber trim, architraves, windows and door frames
  • MDF and wood based composites
  • Concrete blocks, stucco and masonry


  • Should not be be subjected to prolonged exposure to rain or sun. Apply a high quality paint as soon as practicable after curing
  • Not suitable for use with substrates which are permanently wet or subject to regular saturation
  • Fill larger holes by applying filler in multiple layers, allowing filler to cure between applications

Safety and Storage:

  • Keep contents out of reach of children
  • Store in a cool dry place out of direct sunlight for prolonged shelf life
  • Content is non-hazardous and non-toxic
  • Dispose of empty container responsibly

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