Color washing furniture takes several hours because it involves waiting for objects to dry. In order to color wash your furniture, you need a bucket, water, paint, a paintbrush, some sandpaper, some cloth, clear polyurethane and the object that you would like to color wash.
Mix the paint and water
Pour some water and paint into your bucket. You should use a small amount of paint to start, approximately 1/10th of the amount of water being used. Test this mixture by inserting a piece of scrap wood.
Dip the object into the mixture and brush upwards
Place the bottom of the object you are color washing into the bucket, so that it begins to soak in the paint and water mixture. Begin to brush upwards until the entire surface has been coated at least once. Multiple coats may impart a richer color, but the shade varies, depending on the number of coats applied.
Let the object dry
Set the object down somewhere safe and protect your other furniture and flooring with the cloth. Give it some time to dry completely.
Add more paint and repeat if necessary
Examine the dry object. If you are happy with the appearance, move on to the final step. If you would like a more intense coloring, add more paint and repeat the above steps until you have achieved the color you like.
Sand and seal the object
Rub down the surface of your object lightly with sandpaper. Apply a coat of clear polyurethane to give it a neat, finished look.