Red Seal Drywall Finisher and Plasterer Practice Exam

When is the appropriate time to apply a second coat of joint compound?

1. Before the first coat dries

2. After the first coat has completely dried and been sanded

3. Only if the first coat shows imperfections

4. At the end of the project

The correct answer is: After the first coat has completely dried and been sanded

The appropriate time to apply a second coat of joint compound is after the first coat has completely dried and been sanded. This practice is essential for achieving a smooth and professional finish. Once the first coat is dry, sanding helps to remove any ridges, imperfections, or excess material that may have occurred during application. This creates a clean surface for the second coat, allowing it to adhere properly and ensuring that the final finish is even and aesthetically pleasing. Applying the second coat before the first has dried can lead to complications, such as improper adhesion, increased drying time, and potential surface issues. Relying on the first coat's appearance alone without sanding may result in visible imperfections that would carry over to the final finish. Finally, waiting until the end of the project does not allow for the necessary refinements and adjustments to be made along the way, which could compromise the overall quality of the drywall finish. Hence, the methodical approach of letting the first coat dry and adequately preparing the surface through sanding is crucial for quality work.