Term: varnish

Varnish is a transparent, hard, protective finish or film primarily used in wood finishing. It is typically composed of a drying oil, a resin, and a solvent or thinner. Once applied, the solvent evaporates, and the remaining components cure to form a durable, glossy (or sometimes satin or matte) coating that enhances the appearance of the surface while protecting it from moisture, scratches, and UV damage.

In the painting and decorating industry, varnish is commonly used on timber surfaces such as floors, furniture, doors, and trim to highlight the natural grain and provide long-lasting protection. Varnishes can be oil-based or water-based, and may be designed for interior or exterior use depending on the formulation.