The Painting Process
If the tiles are glossy, scrub them with a sandpaper. This will make the surface a bit rough helping the paint bind well with it. Clean up the dust after sanding the tiles. If you don't want to paint the entire floor with colors, put painter's tape on portions where you do not need color.
Application of Primer
Available in two types; the primer enables the paint to adhere to the tiles well. The first type is the oil-based and the other is the shellac-based. You can choose any one of them. Make sure you read the guidelines given by the manufacturers before applying them on the tiles. Usually, two coats of primer need to be applied.
After applying the first coat, wait until it dries up completely and then apply the second coat. Generally, the manufacturers do mention the drying times in their instructions. Once the second coat dries up, rub a sandpaper once again lightly over the primer. This is required to remove any lumps of primer formed.
Start painting the tiles from the corners and the areas near the walls with the help of a brush. You need a number of coats of paint before you can achieve the desired results. Let each coat dry completely before you apply the next one. The paint requires at least 2 weeks to dry up. So, keep it undisturbed.
For the finishing touch, you have to apply a floor finish. Water-based urethane works best for the ceramic tiles. Again, just one coat of finish will not do and you have to apply a number of thin layers.
Never use latex paints as they do not last for a long time on the tiles. It is not at all necessary that you have to use one color for the entire surface. You can try out different color combinations and various designs on the ceramic tiles. The result will surely be stunning.