990 PREP-STEP INT LATEX WALLBOARD PRIMER QT | Prep-Step interior latex wallboard primer provides a high quality base coat for latex or oil based paints. Primes and seals new drywall, wallboard and previously painted walls, cured plaster and patching compound. Assures tight bonding and increased coverage of the finish coat. Dries quickly so finish coat may be applied on the same day. Cleans up easily with soap and water.