Surface PreparationQuestion 12 of 100
What is the purpose of a primer/sealer on new, unpainted drywall?
a.To make the wall glossy
b.To equalize porosity between the paper and joint compound so the finish coat looks uniform
c.To replace the need for taping joints
d.To add texture to the finish
Explanation
New drywall has paper facing and joint compound with different absorption rates; without a sealer the finish coat flashes and shows joints. A drywall primer/sealer (PVA primer) evens out porosity so the topcoat dries to a uniform sheen. It also improves adhesion of the finish coat.
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