This Ronseal One Coat Stain Block can be used before painting to permanently block stains from showning through. It covers nicotine, crayon, grease, and much more.
Permanently blocks stains in 1 coat and is ready to paint over in 4 hours.

Before you start, make sure you're in a warm, well ventilated room. All surfaces should be clean, dry, and free from dust, and any surrounding surfaces or holes/cracks should be masked with the correct filler.

Coverage: 8m² per litre.
Usage areas: All interior walls and ceilings.
Compatability: Bare or previously painted walls and ceilings.