Blocking a reoccurring water stain
A nagging problem can be blocking stains. Whether it’s pinesap bleeding through on a piece of trim, lipstick or crayon on a wall, or a water stain from an old leak, stains can be very persistent. Use spray-on shellac. It will block almost any stain instantly and prevent further bleeding. It dries very fast and also acts as a primer for small areas. Then just paint as needed.