Polyurethane and Shellac

Polyurethane noun - Any of various polymers containing the urethane radical; a wide variety of synthetic forms are made and used as adhesives or plastics or paints or rubber.

Shellac and polyurethane are semantically related in wood finishing topic. In some cases you can use "Shellac" instead a noun "Polyurethane".

Shellac noun - Lac purified by heating and filtering; usually in thin orange or yellow flakes but sometimes bleached white.

Polyurethane and shellac are semantically related in wood finishing topic. You can use "Polyurethane" instead a noun "Shellac".