Painting and Drywall Repair Flashcards

A technician needs to repair a 4-inch diameter hole in a drywall wall where there is no stud directly behind the damage. Which of the following is the most effective method to ensure a durable, long-lasting repair?

Answer: Apply a self-adhesive fiberglass mesh patch and then cover it with joint compound.

A self-adhesive fiberglass mesh patch provides the necessary backing and structural support over the hole, preventing the joint compound from cracking or falling through. This method is standard for holes too large for spackle alone but not large enough to require cutting in a new piece of drywall.

When preparing a previously painted apartment wall for a new coat of paint, which of the following is the most critical first step to ensure proper adhesion of the new paint?

Answer: Clean the wall with a suitable cleaner to remove dirt, grease, and grime.

Paint will not adhere properly to a surface that is contaminated with dirt, dust, grease, or other residues. Cleaning the wall thoroughly is the essential first step before any sanding, priming, or painting to ensure the new coat has a clean, stable surface to bond to, preventing peeling and other failures.

A maintenance technician notices that fresh paint applied in a bathroom is starting to bubble and blister a week after application. The ventilation fan is confirmed to be working. What is the most likely cause of this paint failure?

Answer: The new paint was applied over a glossy surface without proper sanding or priming.

Paint, especially latex-based paint, has poor adhesion to glossy or semi-gloss surfaces. If the old, shiny surface was not dulled by sanding or properly prepared with a bonding primer, the new coat of paint cannot create a strong bond, leading to bubbling and peeling, a problem often accelerated by the high humidity in a bathroom.

What is the primary purpose of applying a PVA (polyvinyl acetate) primer to new, unpainted drywall before applying the topcoat of paint?

Answer: To seal the porous surfaces of the drywall paper and joint compound for a uniform finish.

New drywall has two different textures with different levels of porosity: the paper surface and the joint compound over seams and screw holes. A PVA primer seals these surfaces so they absorb the topcoat of paint at the same rate, preventing blotchy, uneven spots (a problem known as 'flashing') and ensuring a consistent, uniform appearance.

Which tool is specifically designed with a wide, flexible blade for applying thin, feathered coats of joint compound over drywall seams and patches?

Answer: Drywall taping knife

A drywall taping knife, which is typically 6 inches or wider, has a more flexible blade than a putty knife. This design is ideal for spreading joint compound smoothly over taped seams and feathering the edges to blend seamlessly with the surrounding drywall surface.

During an apartment turnover, a technician needs to select a paint finish for the main living area walls that offers good durability and washability, while also minimizing the appearance of surface imperfections. Which paint sheen is the most appropriate choice?

Answer: Eggshell or Satin

Eggshell and satin finishes provide a good balance for high-traffic areas. They are more durable and easier to clean than flat or matte finishes, but have a lower level of shine than semi-gloss or high-gloss, which helps to hide minor imperfections on the wall surface.