Choose paint for your project. Select paint appropriate for your outdoor project. You will need a paint that is resistant to moisture and sun exposure. Outdoor concrete paint is available for outdoor projects. However, an oil-based paint also may work for your needs. Pick a paint for your indoor paint project. Basement concrete paint is available in many paint and home improvement stores, however you also can use an interior acrylic paint for the project.
Clean the concrete wall. For exterior projects, use a power washer to rid the wall of all dirt and dust. If your project is indoors, scrub the wall with soapy water and a scrub brush instead of using a power washer.
Repair any cracks or blemishes in your wall with concrete patch. Follow the directions to mix up the concrete patch mixture. Fill holes and use a trowel to smooth the patch to match the surface of the wall.
Check the wall for moisture. Paint applied to a wall that is not properly sealed will not adhere properly. Tape plastic sheeting to the wall. Attempt to get the sheeting as air-tight as possible. Check the plastic after 24 hours. If moisture appears within the plastic, you will need to seal the wall. If no moisture is present, the wall is already sealed.
Seal the concrete wall. Roll on 1 coat of concrete sealer and allow it to dry overnight. Concrete sealer is available at most hardware or home improvement stores. Concrete sealer prevents water from absorbing into the concrete and helps prevent stains.
Apply 1 coat of concrete primer. You can use rollers or brushes to apply the paint. Ensure the primer is applied evenly, whichever technique you use. Let it dry for 24 hours. If you can see the wall through the primer, apply 1 more coat.
Paint your wall with concrete paint. Paint should be applied in at least 3 thin layers. The paint may be sprayed on, rolled on or painted on with a brush. The paint should not be streaky or show brush strokes. Allow to dry for 24 hours.
Roll on concrete paint sealer. Cover with 2 coats, allowing it to dry between coats. Paint sealer helps the paint to adhere to the wall and last longer.
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