Red Seal Lather (Interior Systems Mechanic) Practice Exam

What is the standard recommendation for finishing drywall joint compound between coats?

1. Apply a thick layer

2. Sanding lightly between coats

3. Skip sanding completely

4. Use a wet sponge to smooth

The correct answer is: Sanding lightly between coats

Sanding lightly between coats of drywall joint compound is crucial for achieving a smooth and professional finish. Light sanding helps to remove any imperfections, bumps, or inconsistencies that may have occurred during the application of the previous coat. This practice ensures better adhesion for subsequent layers of compound, resulting in a flatter and smoother surface once the final coat is applied and sanded. When each coat is sanded lightly, it allows the finishing compound to better bond with the layers beneath, reducing the risk of cracks and ensuring a seamless appearance. This step is essential for achieving the high-quality finishes expected in professional drywall work, as it sets the foundation for the final surface that will receive paint or other finishes. While applying a thick layer may seem like a way to fill in imperfections, it can lead to longer drying times and increased chances of cracking or sagging. Skipping sanding completely would result in a less smooth surface, while using a wet sponge to smooth might not provide the level of refinement required between different coats of compound. Therefore, the recommended practice of lightly sanding between coats is the best approach.