Which term describes the active period before the material hardens during glazing?

• A. Open time
• B. Gel time
• C. Set time
• D. Working time

Answer: (D)

The main idea here is the period when the glaze remains workable before it starts to harden. That window is called the working time. During this time you can apply, blend, and adjust the glaze so it goes on evenly and you can achieve the desired finish. Once the glaze begins to cure and lose its flow, you’re out of working time and the surface won’t be as easily manipulated.

Open time is related but distinct: it’s about how long you can rework the surface after initial application to achieve proper bonding or blending with subsequent coats. Gel time marks the moment the mixture begins to gel, a specific point in the curing process, not the general usable window. Set time is when the glaze has hardened enough to be considered solid and no longer workable. So the term that best describes the active period before hardening is working time.