How to Paint Concrete Expansion Joints

Painting concrete makes the surface more attractive and easier to clean. Painting a concrete floor is a job that you can easily do yourself. However, concrete expansion joints require special preparation before you can apply a coating. The expansion joints in the concrete allow the concrete to adjust to the expansion and contractions caused by the weather changing from hot to cold. The expansion joints prevent random cracking in the concrete slab. You can prepare and paint concrete expansion joints with just a few basic tools.

Broom
Expansion joint sealer
Caulking gun
Utility knife
Paintbrush
Concrete paint

Instructions

- 1
  Sweep the concrete expansion joints with the broom. The expansion joints should be free of any debris. Prepare the concrete slab for painting according to the paint manufacturer's recommendations.
- 2
  Place a tube of concrete joint sealant into the caulking gun. Cut open the tip of the sealant tube with the utility knife.
- 3
  Squeeze the trigger on the caulking gun to release the sealant from the tube. Hold the tip of the sealant tube near the top of the expansion joint. Fill the entire length of the expansion joint with sealant. The expansion joint should be filled to the top. Allow the expansion joint sealant to dry according to the manufacturer's instructions.
- 4
  Place the paintbrush into the concrete paint. Brush the concrete paint onto the top of the concrete joint sealer. Paint the entire length of the concrete joint. Repeat this for each of the expansion joints. Let the paint dry according to the manufacturer's instructions. Apply additional coats of paint if necessary.

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