Red Seal Lather (Interior Systems Mechanic) Practice Exam

Which common household item can be used to clean dusty surfaces before painting drywall?

1. A dry cloth

2. A vacuum cleaner

3. A damp sponge

4. A feather duster

The correct answer is: A damp sponge

Using a damp sponge to clean dusty surfaces before painting drywall is a practical approach because it provides both cleaning power and minimizes dust dispersion. The moisture in the sponge helps to capture and hold onto the dust particles rather than just moving them around in the air or onto other surfaces. This results in a cleaner surface, which is essential for proper paint adhesion. When preparing drywall for painting, it's crucial to ensure that the surface is as clean as possible to achieve a smooth finish. A damp sponge is particularly effective on drywall, which tends to accumulate dust and debris. The sponge is flexible and can easily conform to the surface contours, ensuring that even the smallest dust particles are removed. While a dry cloth might remove some dust, it can also just push the particles around or cause them to become airborne, leading to further contamination. A vacuum cleaner is a good alternative for larger areas, but may not be as effective in tight spaces or on textured surfaces. A feather duster can be useful for light dusting, but it does not capture dust effectively and might leave behind residue. Hence, the choice of a damp sponge aligns with best practices for surface preparation before painting drywall.