What preparation should I do before I paint my walls?
If your walls are bare, then you should use the recommended primer for that type of surface. For previously painted walls, you should always thoroughly wash them with a mild soap and water solution, then rinse them with clean water. Existing semi-gloss or gloss paints should be lightly sanded to a duller finish. If the walls have not been painted in five years or longer a primer sealer should be applied.