Red Seal Lather (Interior Systems Mechanic) Practice Exam

What technique helps achieve a smooth surface during the finishing process?

1. Using textured paint

2. Applying joint compound

3. Skipping the taping step

4. Using thicker drywall boards

The correct answer is: Applying joint compound

Applying joint compound is an essential technique for achieving a smooth surface during the finishing process in drywall installation. The joint compound, often referred to as mud, is used to fill in the seams between sheets of drywall, cover screws or nails, and create a seamless surface for painting or other finishes. When joint compound is applied correctly, it can be sanded down to a fine texture, eliminating any bumps or imperfections left from the drywall installation. A series of thin layers is typically applied, allowing each coat to dry before the next is added. This layering process not only helps in achieving a smooth finish but also aids in feathering the edges of each application, which ensures a seamless transition between the mudded areas and the drywall surface. The other options, while they might serve a purpose in different contexts, do not directly contribute to creating a smooth surface. Textured paint would inherently add texture, which is the opposite of a smooth finish. Skipping the taping step would lead to visible seams, which would detract from a smooth appearance. Using thicker drywall boards may offer more strength or insulation but does not influence the smoothness of the surface achieved during finishing.