Adhesion: Plasma cleans at the molecular level to promote bonding by removing contamination that might otherwise be trapped. Plasma process, with the right gas mixture, renders the substrate hydrophilic (wetting) by increasing surface energy and decreasing surface tension, such that adhesives spread over the surface of the substrate without voids.
Examples include wear harnesses for aircraft (remember this the next time you fly!) and automobiles (or drive!), underwater cables for naval use or for offshore drilling platforms.