Before you begin
For optimal results, your concrete must be clean, dry and free of dirt, grease, oil or other contaminants before applying Valspar concrete coatings. Concrete that has been previously sealed or that contains excess moisture cannot be coated. To ensure your concrete is able to accept a coating, we recommend you test the surface as instructed below for moisture content and presence of obstructive sealer before beginning this project.
Test for presence of sealer
Sprinkle a few beads of water onto the surface. If they soak into the concrete, you're ready to begin. If they remain on the surface, it is likely your surface has a coating, and you must strip it away before you apply a Valspar coating. Purchase a coating stripper at your local home improvement center and follow the manufacturer's instructions to thoroughly remove the existing coating before you begin this project.
Test for excess moisture
Tape a 2' x 2' piece of plastic wrap to the concrete using duct tape on all edges. Allow the plastic to sit for 24 hours. If water droplets appear on the underside of the plastic, or if the concrete is damp, the surface contains excess moisture and should not be painted. You must correct the moisture problems before you begin this project or the coating will not penetrate the surface properly.