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How to Repair Wooden Muntins

Wooden muntins serve both an aesthetic and functional purpose on traditional wooden windows. They divide the glass window panes with a decorative wooden profile while holding the panes in place. Because they are exposed to the weather, they can become damaged over time. This is especially true when the paint or glazing on the windows is in disrepair. You can repair your wooden muntins to good condition with patience and attention to detail using wood epoxy. It is important to immediately repair damage to your wooden windows so you can avoid costly replacement.

Things You'll Need

  • Wire brush
  • Putty knife
  • Epoxy primer
  • Natural-bristle brush
  • Epoxy filler
  • Fine-grit sanding pad
  • Primer
  • Paintbrush
  • Exterior paint
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Instructions

    • 1

      Brush the damaged area of the muntins with a wire brush in the same direction as the wood grain. Remove all of the loose, rotted wood and debris from the muntins.

    • 2

      Chip out all of the rotted wood in the muntins with the tip of a putty knife. Brush the cleaned-out rotted spots with the wire brush.

    • 3

      Brush an even coat of epoxy primer onto the damaged areas of the muntins with a natural-bristle brush. Allow the primer to dry for at least four hours.

    • 4

      Fill the damaged areas of the muntins with epoxy filler, using the blade of a putty knife to pack it into the wood. Smooth the filler over the damaged areas so that it is just raised above the wood surface. Allow the filler to dry for 24 hours.

    • 5

      Sand the repaired areas of the muntins with a fine-grit sanding pad. Be sure to sand the dried epoxy filler in the same direction as the wood grain. Continue sanding until the filler is flush with the surface of the wood.

    • 6

      Brush on a coat of primer and a top coat of paint using a paintbrush. Allow the primer to dry at least four hours before applying a top coat of exterior paint.