Which four types of sealers are typically applied to prepare wood surfaces?

• A. Shellac, varnish, lacquer, and sanding sealers.
• B. Wax, oil, water-based sealers, and polyurethane.
• C. Shellac, varnish, lacquer, and enamel.
• D. Wax, enamel, polyurethane, and shellac.

Answer: (A)

The question is testing your knowledge of the common sealers used to prepare wood surfaces before applying final coats. The best answer includes shellac, varnish, lacquer, and sanding sealer because these four are the traditional prep sealers that create a good, even base for topcoats.

Shellac acts as a fast-drying barrier that blocks stains and knots and provides a dependable underlayer for subsequent finishes. Varnish forms a durable film that smooths the surface and helps even out absorption, giving a solid foundation for the next coats. Lacquer dries quickly and sands easily, producing a very smooth base with minimal grain raising, which is why it’s favored as a prep option in many workflows. Sanding sealer is specifically designed to seal pores and fill grain, delivering an ultra-smooth surface that reduces sanding effort for the final finish.

Other options mix in finishes or coatings that aren’t typically used as prep sealers: wax sits on the surface as a smoothing layer rather than sealing deep; oils are penetrating finishes, not primer sealers; polyurethane and enamel are generally used as topcoats or durable surface finishes rather than prep sealers.