Which action best supports preventing adhesion problems on porous or stained areas?

• A. Spot prime porous or stained areas.
• B. Prime the entire surface every time.
• C. Skip priming altogether.
• D. Only use topcoat on such areas.

Answer: (A)

Spot priming porous or stained areas targets where adhesion problems are most likely to occur. Porous surfaces pull in primers and moisture, so sealing just those spots creates a uniform base for the topcoat. Stains or tannins can bleed through paint, and a stain-blocking primer on those areas stops that bleed and helps the finish adhere properly. Priming only the necessary areas also preserves even film thickness across the surface and saves material. Priming the entire surface wastes primer and can create inconsistencies, while skipping priming leaves the porosity or stains unaddressed. Merely applying topcoat on problem spots won’t solve the underlying adhesion issues.