Varnish is simply a transparent substance that provides a protective layer between the paint and the atmosphere. It stops things like dirt, dust and UV light doing long-term damage to the painting, while also giving the painting a sort of glossy after-effect. Any dirt, dust or IV light will affect the varnish and not the painting. The varnish can be removed and another layer reapplied, so your painting should always be protected. Call us to assist.