coating

noun
  1. A layer or covering of a substance spread over a surface for protection, decoration, or other purposes. noun
    The car had a shiny coating of wax to protect its paint.
    The cake was finished with a coating of chocolate glaze.
  2. The process of applying a layer or covering to a surface. noun
    Coating the metal with paint helps prevent rust.
    The coating process ensures that the tablets are easy to swallow.