A varnish is a transparent, hard, protective film primarily used to provide a protective layer over artwork. Varnishes are traditionally a combination of drying oil, resin and solvent. Varnish finishes are usually glossy but may be made to produce satin or matte surface by the addition of "flatting" agents. Varnish has little or no color, is transparent, and has no added pigment, as opposed to paint or stain, which contains pigments or dyes and generally range from opaque to translucent. Varnishes are also applied between layers of paint to isolate them or over substrates, such as wood, to seal the surface and reduce absorbency.
The most important traditional varnish is dammar. It is the only traditional coating system that is still widely used and recommended as suitable for artwork. Other resins, such as copal or mastic, although still in use, suffer from cracking, extensive yellowing, and become increasingly difficult to remove from a painting over time. Although dammar does turn yellow to brown within about fifty years of normal exposure conditions, it is still removable from an oil painting surface without greatly affecting the paint layers below.
Conservar Finishing Varnish is a colorless, reversible varnish made from hydrogenated hydrocarbon (Regalrez 1094) resin dissolved in pure, low-aromatic solvent and UV stabilizer.
Conservar Isolating/Finishing Varnish is a colorless, reversible varnish made from aldehyde (Laropal A81) resin dissolved in pure, aromatic and aliphatic solvents with UV stabilizer.
Conservar Dammar Finishing Varnish is a varnish made from the best grade of natural dammar resin dissolved in aromatic and aliphatic solvents with UV light stabilizer.