A critical step before painting, priming seals the surface and prolongs the wet edge of finished coats, reducing lap marks and ensuring a uniform color and luster.
There is a common myth that walls that have been painted many times do not need priming, but many layers of latex paint can actually result in a surface
that is very absorbent and requires priming.
It is usually not necessary to apply primer to sashes,
trim and doors that already have an enamel finish. If extensive repair work has been done, however, you should apply a primer to these areas.
Priming Products to Use
For patched wall surfaces, spot prime with Regal First Coat® or Fresh Start® primers. For new drywall, we recommend using a latex primer.
When applying primer to previously painted drywall, use Moore's® Alkyd Enamel Underbody, Moore's Alkyd Primer Sealer, Regal First Coat, or Fresh Start.
For walls and ceilings with a porous, flat finish, use Regal First Coat or Fresh Start.
Wood surfaces that are unpainted or that have been previously painted and sanded should be primed with Moore's Alkyd Enamel Underbody or Fresh Start.