What is the standard protective coating sequence over gold leaf before final polishing?

• A. Wax, then sealant
• B. Clear varnish only
• C. A coat of shellac followed by varnish, if necessary, before final polishing
• D. A layer of polyurethane

Answer: (C)

Protecting delicate gold leaf before the final polishing step relies on building a proper seal that both shields the leaf and provides a solid surface for finishing. A coat of shellac is applied first because it forms a hard, smooth, and quick-drying barrier that adheres well to gold leaf and isolates it from solvents or moisture in subsequent coatings. If you need additional protection or a specific sheen, you can lay down varnish over the shellac after it’s dry. This combination—shellac first, then varnish if needed—gives a durable, stable surface for polishing without risking damage to the leaf.

Wax isn’t ideal here because it’s soft, can attract dust, smear, and degrade under friction or heat. Polyurethane is generally avoided over gold leaf because it’s thick, can yellow or craze over time, and doesn’t interact as nicely with shellac. A layer of clear varnish alone wouldn’t provide the same protective barrier or adhesion control for the leaf as the shellac does, which is why the shellac-first approach is preferred.