Wear and corrosion, in their different forms, are the two major and cost bearing side effects in today’s severe operating environment. Aerospace applications are no exception to this decree and a lot of effort is exhausted due to inability of the aerospace industry to comprehensively deal with these critical elements. Applications where existing material technologies are no longer capable of meeting ever increasing performance requirements provide the greatest opportunity for improvements via alternative solutions such as coatings. Improvement of conventional technologies and development of alternative coating techniques and materials has always been of great importance to PST. This is especially true for unique applications where traditional approaches have been already exhausted.