Polyurethane Varnish

Last updated: November 6, 2017

What Does Polyurethane Varnish Mean?

Polyurethane varnish is an oil-based, water-resistant liquid substance that is used to make surface paints. It is applied as a protective coating to metal surfaces that are prone to corrosion, and to wood and other materials.


Corrosionpedia Explains Polyurethane Varnish

Polyurethane varnish is a synthetic material that is formed by a reaction of isocyanate with a polyhydric alcohol. It is highly durable, resistant to heat, chemicals and physical impacts that would otherwise cause wear and tear. The application of polyurethane varnish leaves a shiny, lustrous finish on a material’s surface.

For most applications it is used as a protective coating to prolong the life of a surface. However, in some instances it is used purely for aesthetic reasons – such as when painted on wood. Polyurethane varnish improves the look and value of wood that is used to build furniture, art or interior fixtures.


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