Red Seal Drywall Finisher and Plasterer Practice Exam

Which tool is typically used for mudding inside corners?

1. Flat trowel

2. Joint knife

3. Inside corner trowel

4. Paint roller

The correct answer is: Inside corner trowel

The inside corner trowel is specifically designed to create a smooth finish in the often tricky inside corners of drywall installations. Its unique shape allows it to fit snugly into corners, ensuring even application of joint compound (mud) without leaving excess material on the walls. The tool's angled edges and width help achieve a clean, professional look, which is crucial for seamless joints in drywalled surfaces. Using the inside corner trowel promotes efficiency and accuracy, making it the preferred choice among drywall finishers. Other tools, such as the flat trowel and joint knife, are versatile for flat surfaces or compound application but may not provide the corner-specific advantages that the inside corner trowel does. A paint roller is not suitable for mudding purposes, as it is intended for applying paint rather than joint compound.