Close the gaps of the six leaves of the cap by applying the nail polish on the inside of the cap using the nail polish brush. It is easier to do this in stages.
Do not use too much nailpolish to avoid the polish from pouring through the holes of the cap. Let the cap dry.
If a little hole appears in the polish or if there are some spots where the layer is too thin, just add some more polish on the inside of the cap. By holding the cap in front of a lamp the holes and thin spots can easily be seen.