Knowing how to paint concrete floors can make the difference between a stylish statement and a mess. Make sure the primer you are going to use is well-suited both with the concrete floor and paint. How To Paint Cement Floors Diy Lifestyle Painted Cement Floors Painting Cement Cement Floor Diy Apply the First Coat of Concrete Floor Paint. Apply Painting Concrete Floors . Mop the surface with a stiff bristle broom and an all-purpose cleaner. Use patching compound to fill any holes scratches or gouges in the concrete surface. Check the plastic for condensation after 24 hours. Wait until the primer gets dry. If there is condensation under the plastic the floor shouldnt be painted until the source of the moisture is discovered and the issue is resolved. If your floor surface is smooth skip to the next step. It will assist in setting the new color on the floor surface smoothly. See more ideas about concrete floors concrete stained floors flooring. Once the primer is dry