Vacuum the walls to ensure they are free of dirt, dust and other debris.
Dump a small amount of fast-drying alkyd painting primer into a paint try. Fast-drying alkyd primer will seal the textured paint so it does not get wet from the latex paint. Roll the paint roller in the primer, and apply the primer to the walls in a “W” motion. Cover the textured paint completely. Allow the primer to dry. Apply a second coat of primer as needed.
Pour a latex paint into a paint tray. Use a paint roller to paint the walls in a “W” motion. Once the wall is covered, let it dry completely. Repeat two more times or as needed.