Dies often need a film of lubricant to be sprayed over their surfaces while open. This can be challenging for humans to do consistently since access is poor, mist obscures the view and fatigue sets in quickly. As a result, this leads to excess lubricant in some areas and insufficient lubricant in other areas, resulting in uneven die cooling and casting defects. However, for a robot, this is a straightforward task as it can follow the programmed path accurately every time.