CoversUp™ Aerosol is a low odour vertical aerosol that is a stain killer and ceiling touch-up paint in one. Zinsser's stain blocking primer technology is incorporated into this next generation product that offers a flat white finish, which matches most acoustic ceiling tiles and white ceiling paints. CoversUp™ is a great stain blocking primer for any ceiling surface. It is the perfect touch up paint when you do not want to repaint the entire ceiling due to spot damage. One coat of CoversUp™ permanently blocks and seals most common ceiling stains.