Paint is a kind of paint. Folk will be used as a wall of water-based paint is a one-sided coating.
Ink can also be understood as a paint, but it is mainly to color-based, not to provide some kind of protection-like, like the temperature coating is the same display temperature.
Generally speaking, the coating is a water-soluble material for the adhesive, for the wall of the paint.
Generally speaking, the paint is based on oil-soluble material as a binder coating.
All materials used for coating and having certain functions are coatings.