There is no need to varnish in the final painting except to unify the shiny, matte or satin. The paintings done by an airbrush cons are scratching easily require a protective varnish. In the event that a work should be protected from ultraviolet radiation, it is preferable to apply a coating with a protective UV or in the case of wall paintings.
Painting is very stable and resistant layer is even washable with soap and water. In some cases, or when the colors are highly diluted, it is necessary to varnish.
The varnish can also change the brightness. It is necessary to wait until the paint is well taken to heart before varnishing.
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