Substrate correction is not needed for which substrate?

Substrate correction is not needed for which substrate?

• A. Brick
• B. Concrete
• C. Drywall
• D. Plaster

Answer: (A)

Substrate correction means shaping or repairing the surface so the coating will bond and cure properly. Brick typically doesn’t need this because its rough, porous surface already provides good mechanical adhesion after cleaning. Trying to smooth brick would reduce its natural grip and could trap moisture, making adhesion harder in the long run. In contrast, concrete, drywall, and plaster commonly have smoother areas or visible defects (cracks, gaps, uneven joints) that must be repaired or filled to create a uniform surface for a dependable coating or treatment.

Substrate correction means shaping or repairing the surface so the coating will bond and cure properly. Brick typically doesn’t need this because its rough, porous surface already provides good mechanical adhesion after cleaning. Trying to smooth brick would reduce its natural grip and could trap moisture, making adhesion harder in the long run. In contrast, concrete, drywall, and plaster commonly have smoother areas or visible defects (cracks, gaps, uneven joints) that must be repaired or filled to create a uniform surface for a dependable coating or treatment.