How Many Coats of Primer on Drywall?

Why Prime?

• The moisture level of the paper of the drywall material and the mud of joint compound will differ. The primer seals both materials creating a uniform level of moisture across the entire wall or ceiling. The moisture differences can lead to a blotchy final finish when the top coat of paint is applied. Primer also improves the adhesion between the paint and the drywall producing a more stable finish.

Gloss, Satin or Flat

• Priming is particularly important if a gloss or satin finish is planned for the drywall. The high level of absorbency of the drywall paper draws in enough of the paint that even a glossy surface appears flat. This makes primer more important for gloss or satin finishes although a good primer improves the looks of a flat paint as well.

But I Didn’t Prime

• If you didn’t prime you may need to apply an extra coat of the finish paint. This may prove more expensive than priming the drywall initially. Finish paints may not seal the drywall material as well as a primer leading to possible transfers of odor and stains to the drywall material.

Priming Painted Drywall

• Prime the entire surface of a new drywall project. However, if a wall is being repaired a little primer work may be all that’s necessary. Prime any area where new joint compound has been applied or where the old paint has been removed to the drywall surface. Allow the primer to dry overnight before applying the finish coat or coats of paint.