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See all Exterior paint how-to »

How to Repair a Crack on a Wood Surface

Skill:  Intermediate DIY'er

Now is the time to repair the cracks in your wood siding. Before you apply a fresh coat of paint, make sure your surfaces are in good condition.

For Best Results:

Follow our how-to for the proper steps to repairing cracks in your wood exterior.

Suggested Supplies
  • 5-in-1 Tool
  • Vinyl Gloves
  • Ladder
  • Patching Material
  • Protective Apparel
  • Putty Knife
  • Rags
  • Sandpaper
Suggested Products
  1. Step 1

    Using 80 to 100-grit sandpaper, remove any loose debris from the cracked area.

    Use a 5-in-1 painter's tool to widen cracks that are less than ¼" wide. This will remove the paint and other debris from the cracks and will allow the patching material to bond tightly to the damaged area.
  2. Step 2

    Using 100-grit sandpaper, lightly sand any raised or rough areas. Remove any dust or debris from the area with a lightly water-dampened rag.

  3. Step 3

    Using a putty knife, spread a thin layer of patching material into the cracked area. Allow it to dry.

    To create an even surface, always smooth out (feather) the patching material 1"-2" beyond the repaired area.
  4. Step 4

    Use 220-grit sandpaper to smooth the patched area and make it even with the surface.

    If shrinking of the patching material occurs, lightly sand and clean the area and apply additional layers of patching material as needed.
  5. Step 5

    Remove any final dust or debris from the finished repair.