How should a slightly damaged plaster wall containing asbestos be repaired to prevent dust?

• A. Sanding until smooth, then applying joint compound.
• B. Remove plaster entirely and replace.
• C. Apply highly adhesive film or use asbestos-free joint compound without sanding.
• D. Seal with ordinary plaster primer.

Answer: (A)

The idea being tested is how to limit asbestos dust when repairing a plaster surface by creating a stable, sealed finish. Smoothing the slightly damaged area and then applying joint compound builds a continuous, durable layer over the surface. The sanding helps remove loose material and create a uniform base so the joint compound adheres well, while the subsequent layer encapsulates residual fibers and forms a barrier that reduces any future dust release. In real-world work, handling asbestos requires licensed professionals and proper containment, but in this exam context the approach emphasizes restoring a solid, sealed finish to prevent fibers from becoming airborne.

Other options involve greater risk of disturbing fibers or failing to provide a durable finish: removing the plaster fully can release fibers and trigger abatement requirements; relying only on a film or primer doesn’t provide the necessary barrier or surface to paint and seal; and using an asbestos-free compound without addressing the surface integrity may not effectively encapsulate all loose material.