Red Seal Drywall Finisher and Plasterer Practice Exam

How should a bubble in joint compound be fixed?

1. Leave it as is

2. Apply a thick layer on top

3. Cut out the bubble and apply fresh joint compound

4. Spray additional water and spread it

The correct answer is: Cut out the bubble and apply fresh joint compound

When addressing a bubble in joint compound, the most effective method is to cut out the bubble and apply fresh joint compound. This approach resolves the issue by removing the compromised area that has caused the bubble, ensuring a smooth and even surface upon reapplication. Bubbles can occur due to various reasons such as improper mixing, application in unsuitable conditions, or air trapped beneath the compound. Simply leaving it as is would result in an unsightly finish and potential future issues with durability or adhesion. Applying a thick layer on top would not address the problem at its source and could lead to additional bubbles or cracking as the new layer dries. Spraying additional water and attempting to spread it would not properly fix the issue, as it might not adequately bond the compound that has been disrupted by the bubble. By cutting out the bubble, you are taking decisive action to ensure that the joint compound adheres properly in the affected area, ultimately leading to a high-quality finish upon completion.