Selleys Spakfilla Heavy Duty is a multi-purpose, tough and durable, light grey ready-mixed filler. 


  • Suitable for interior and exterior applications
  • Good adhesions to most surfaces
  • Water and weather resistant
  • Fill cracks and holes in a single application
  • Pre-mixed and ready to use
  • Minimal shrinkage so no need to overfill
  • Very fast drying allowing sanding and painting in a short time period
  • Comes complete with a filling spatula for ease of use
  • Water based, so can be cleaned up with water
  • Paintable with oil and water based paints

Where can this product be used?

  • Filling holes, dents, cracks or chips in interior and exterior applications where no structural movement occurs 

What materials is this product suitable for?

  • Mortar
  • Masonry
  • Concrete
  • Wood
  • Stone
  • Primed metal surfaces
  • Brick
  • Plaster

Please contact your store to confirm avaliability, as some stores may have a limited range.

Size  435g tub
Colours Light Grey
Technology Water based 
Use Interior
  1. Ensure surfaces are clean, dry and free of loose material.
  2. Using the flexible spatula provided on the lid, press the filler firmly into the crack or hole and smooth off surface; there is no need to overfill. For deeper cracks, apply in 6mm layers allowing each layer to dry before applying the next.
  3. Lightly sand back any excess filler from the surface after product dries (2-3 hours for 2mm applications).
  4. Dust off any loose dust before applying undercoat and painting with water-based paints or oil-based paints. 


  • Product is not flexible so not suitable for use between surfaces that are subject the structural movement - use Selleys No More Gaps.
  • Avoid using below 5°C or in wet conditions.
  • Painting with oil-based paints is not recommended until 24 hours after filler has been applied.
  • Water based paints may be used immediately after filler has set.
  • If filler is found to have stiffened prior to use, stir product. Product that has actually hardened should be discarded. If still too dry add one teaspoon of water and stir again to desired consistency.
  • Application tools may be cleaned with water.
  • Before painting, clean dust and filler particles using Selleys Sugar Soap or Selleys Super Kleen.
  • In exterior applications, protect from rain until dry and painted over with 2 coats of paint.
  • Some paints may temporarily discolour when applied over the filler, but will revert to the correct colour once dry.
  • For applications more than 2mm deep, or in cold or humid conditions, expect longer drying times.
  • Keep container closed when not in use.


  • Uncured product may be removed with water.
  • Cured product can be removed by scraping or sanding.



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