Water spotted nails: Paint nails white. Paint nails different colors. Put tape around nails to help with mess. Fill cup with slightly warm water. Much like with water marble, use black and drop 3 to 4 drops into water. Then use hand sanitizer spray and spray one or two times depending on how many circles you want. Dip finger in water and wait ten seconds till polish drys and remove excess around nail with toothpick. Clean up around nail with polish remover and apply a top coat.