Red Seal Carpenter Practice Exam 2025 - Free Carpenter Practice Questions and Study Guide

Varnish or polyurethane is a highly effective finish for protecting wooden surfaces due to its durability and resistance to moisture, chemicals, and wear. These finishes form a tough protective layer on the wood that enhances both its appearance and longevity. Polyurethane, in particular, is favored for interior and exterior wood applications because it dries quickly and is available in various sheens, allowing for customization that suits different aesthetic preferences.

While paint and stain can enhance wood and offer some level of protection, they do not provide the same level of durability or moisture resistance as varnish or polyurethane. Paint creates a solid film on the surface, which can chip or peel, while stains penetrate the wood but often require more frequent reapplication for protection. Shellac, though it can be used for finishing, offers a less durable solution compared to varnish or polyurethane and is more susceptible to damage from heat and alcohol. This makes varnish or polyurethane the preferred choice for robust protection of wooden surfaces.