I want to varnish a mural. How much area does your varnish cover.

As general rule of thumb 1 gallon of Liquitex Varnish (or 128 ounces) will cover appoximately 400 square feet one time. Many factors can change this number a bit including how thick you apply the coats and the surface you are painting. This rule also applies to other Liquitex products with similar viscosity such as Soft Body Acrylic Paint.