How to Fill Cracks With Wood Filler

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Cracks develop in wood over time as it weathers and ages. It is important to fill those cracks as they develop in order to prevent further decay of the wood. Occasional inspection of the wood around your home will allow you to identify these cracks. While there are many types of wood filler, the basic process of repairing cracks is the same.

Things You'll Need

  • 120-grit sandpaper
  • Shop brush
  • Wood epoxy primer
  • Poly brush
  • Wood epoxy filler
  • Putty knife
  • Wood finish touch-up
  • Paintbrush
  • Sand the area with 120-grit sandpaper. Always sand with the grain of the wood.

  • Brush away any dust and debris with a shop brush.

  • Apply a thin coat of epoxy primer to the prepared surface of the wood with a poly brush. Allow the primer to set for five minutes.

  • Fill the cracks with wood epoxy filler using a putty knife to pack the filler into the cracks. Allow the filler to dry overnight.

  • Sand the filler flush with the surface of the wood using 120-grit sandpaper. Always sand with the grain of the wood.

  • Brush a touch-up wood finish to the repaired area with a paintbrush. Allow the touch-up to dry for 72 hours before heavy use.

Tips & Warnings

  • Inspect wood surfaces seasonally to develop a habit of routine maintenance.
  • Wear eye protection when sanding wood.

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