Stained concrete patios offer homeowners a visually appealing surface to enjoy for years to come. Homeowners often find themselves in need of change. Changing the colour of a concrete patio can improve the curb appeal of a home, and homeowners may need to change the colour of a stained concrete patio to match the rest of the decor. Changing a previously stained concrete patio to a new colour will take a little time and a few simple supplies.
Spread an even layer of chemical concrete stripper agent onto the concrete patio using a long-handled paint roller. Allow the chemical stripper to sit on the concrete patio for at least 15 minutes, or as directed in the product instructions.
Rinse the chemical stripper off the concrete patio with the pressure washer. The surface of the concrete must be clean and free of dirt, dust and debris. Allow the concrete to dry overnight.
Mask surrounding areas with painter's tape to protect surfaces from the concrete stain.
Prepare the concrete stain in a 5-gallon bucket. Some concrete stains require the addition of water. Other concrete stains will become different shades depending on how much water you add to the concrete stain to dilute it. Refer to the manufacturer's instructions for complete mixing requirements.
Fill a plastic pump sprayer with the concrete stain. If you are using acid concrete stain, make sure all your equipment is plastic, and there are no metal parts, which will react to the acid. Equip a walk-behind helper with a stiff brush.
Adjust the spray tip on the pump sprayer for a circular patterned spray. Start spraying the concrete patio, walking from left to right, then coming back and working from right to left. Have your helper scrub the stain into the concrete patio with the scrub brush, working in small circular patterns.
Walk back behind the helper after she has finished scrubbing the stain into the concrete, and make another pass with the sprayer to remove brush marks. Allow the concrete stain to completely dry overnight, or as directed by the manufacturer.
Fill a gallon mop bucket with water. Add 1 tbsp baking soda into the water, and stir with a wooden spoon. Dip a mop into the solution, and mop the entire surface of the patio. Suck up excess water with a wet shop vacuum. Allow the concrete patio to dry overnight. This step will neutralise the concrete patio, preparing it for the concrete sealer.
Spread an even layer of concrete sealer onto the concrete patio using a long-handled paint roller. Allow the sealer to dry as recommended in package instructions.
Apply a second coat of concrete sealer and allow it to dry.
After pressure washing the concrete patio, place large fans around the area to speed up the drying process.