A roof leak leaves you with an ugly stain on the ceiling even after the leak is repaired. But you don’t want your family and friends to see it tomorrow at Thanksgiving Dinner, so you need a quick fix. You can’t just paint over the spot with ordinary paint because the stain will bleed through. The solution is a stain blocking primer, like Zinsser’s COVERS UPTM Stain Sealing Ceiling Paint. It’s a low odor spray primer and ceiling touch-up paint in one. The flat white finish matches most white ceilings and the vertical spray nozzle makes it easy to apply. First cover the area beneath the stain with a drop cloth and the begin lightly spraying the primer to cover the stain….when it disappears, feather the primer out around it, so the repair is less visible.