Red Seal Lather (Interior Systems Mechanic) Practice Exam

What is a common treatment for drywall seams before painting?

1. Leaving them untreated

2. Painting over them directly

3. Sanding and applying primer

4. Applying a thick layer of texture

The correct answer is: Sanding and applying primer

Sanding and applying primer is a widely accepted treatment for drywall seams before painting, as it ensures a smooth and even surface. Sanding helps to eliminate any imperfections, such as bumps or ridges, that may occur where the drywall sheets meet. This step is vital because drywall seams can create noticeable lines under paint if left untreated. After sanding, applying a primer is important because it seals the drywall and creates a uniform surface for the paint. Primer also helps to improve paint adhesion and ensures that the final coat of paint appears consistent in color and sheen. This is particularly essential when dealing with joint compounds which might absorb paint differently than the rest of the drywall, leading to an uneven finish. In contrast, leaving seams untreated, painting over them directly, or applying a thick layer of texture can lead to an uneven and unprofessional appearance. These methods often do not address the texture discrepancies and the potential for paint absorption, resulting in a less desirable outcome in the final paint job.