What is the primary advantage of using a primer before applying paint to new drywall?
Correct Answer
B) Provides uniform surface porosity and adhesion
Primer seals the varying porosity between drywall paper and joint compound, creating uniform surface conditions for better paint adhesion and appearance. This prevents uneven sheen and color variations.
Why This Is the Correct Answer
Primer's primary function on new drywall is to create uniform surface porosity and improve adhesion. New drywall has varying porosity between the drywall paper face and joint compound areas, which can cause uneven paint absorption and appearance. Primer seals these different surfaces to create consistent conditions for the topcoat. This prevents issues like flashing, uneven sheen, and poor adhesion that occur when paint is applied directly to unsealed drywall.
Why the Other Options Are Wrong
Option A: Reduces the number of topcoats needed
Primer does not eliminate surface preparation needs. Proper surface preparation including cleaning, patching, and sanding is still required before primer application.
Option C: Eliminates the need for surface preparation
Primer typically does not increase the coverage rate of finish coats. In fact, it may slightly reduce coverage since it seals the surface, preventing deep penetration of the topcoat.
Option D: Increases coverage rate of the finish coat
While primer may help with coverage efficiency, reducing topcoats is not its primary advantage. The main benefit is surface uniformity and adhesion, not necessarily fewer coats.
Memory Technique
Think 'PUPA' - Primer creates Uniform Porosity for better Adhesion. Just like a butterfly needs uniform conditions to emerge from its pupa, paint needs uniform surface conditions to look its best.
Reference Hint
Florida Building Code - Chapter 14 (Interior Finishes) or painting specifications section in construction standards
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