Which steps are included in preparing concrete, masonry, or stucco surfaces before coating?

• A. Clean, repair defects, ensure dry, profile if needed, and use appropriate primer
• B. Apply primer only
• C. Paint while wet
• D. Use only moisture check

Answer: (C)

Surface prep for concrete, masonry, or stucco coatings is about creating a clean, sound, and receptive substrate. Start by cleaning to remove dirt, efflorescence, oils, and any release agents. Then repair cracks, spalling, and loose patches so the surface is solid and uniform. It must be dry, so check for moisture and address any dampness before coating, since trapped moisture leads to adhesion problems and coating failure. If the surface is smooth or dusty, create a proper mechanical key by profiling or etching so the coating can grip. Finally, apply an appropriate primer designed for masonry or concrete to seal the surface and improve adhesion. Skipping these steps or applying paint to a wet surface undermines adhesion and durability, especially on porous substrates.