Clear epoxy coating is an optional post-decoration process, including for badges. It forms a transparent layer over the decorated face and changes how that surface looks and feels. The layer also separates the underlying printed or colored face from direct contact.
Epoxy is not enamel. Enamel provides the color inside defined areas, while epoxy is placed over an existing decoration. A printed badge, for example, can be reviewed with or without a clear epoxy layer depending on the desired presentation. Soft enamel may also be considered with a later clear coating when that combination suits the project.