Just had a look on their site for coverage rates/application etc
The easiest way to apply the paint is a combination of a masonry brush and a long-pile roller, although you can also use an airless spray machine. Emperor Masonry Paint is a two-coat paint which must be applied at 5-6m2 per litre on smooth surfaces, which can be reduced down to 2-3m2 per litre on rough, textured surfaces such as pebbledash. You can dilute your first coat of paint by 10% with water but do not dilute your second coat. While touch dry after 1-2 hours, it is crucial to allow 8 hours at 20°C