Ensure the main cause of damp is fixed prior to applying Stain Block Damp Seal.
Remove wallpaper and flaking paint and wipe down with a damp cloth.
Apply over the affected area, plus 30cm around it.
Wait 4 hours prior before applying a second coat.
Walls can be decorated over 4 hours after the final coat of Stain Block Damp Seal has been applied.
To avoid penetrating damp in the future, use Water Seal on the exterior wall.