A stain on a ceiling is an eyesore that's hard to miss, but painting products can conceal just about any kind of stain. Before repainting the ceiling, use an oil-base sealer and primer like Kilz to ...
Many stains are instantly noticeable. But while a wine stain on a light-colored carpet or a gravy stain on a white shirt tend to jump out right away, other stains sneak past our radars every day.