The image above shows a Taping Knife being used in conjunction with a plastic mud pan. It is recommended to only fill the mud pan up to about halfway as mud pans tend to get heavy and will only make the task at hand more difficult if they are filled right to the top.
The Taping Knife in this example is being
slid across the wall to drag across the
rendering compound. It is advised to avoid using to much compound as cracks are likely to form once it has dried.