Can I paint kitchen tiles with matt wall paint?
If you intend the paint to adhere and be washable you must put a good primer under it, a light sanding of the tiles, followed by wiping it down with a tack-cloth (to remove all of the dust) then use a a primer such as Kilz (not Kilz 2 it is latex and does not work near as well). Once the primer is dry you can top coat with anything.