WallCrete is applied as a skim coat of 3mm thick to either a wood-floated cement plaster or previously painted surface, which must be prepared according to the WallCrete Application Data Sheet. WallCrete creates a distinctly unique mottled look. National Crete Manufacturers do not recommend that any WallCrete be done in showers unless you are experienced in the application thereof, this is for various reasons such as, rising damp, ineffective waterproofing, penetration of water into crevices where floor and wall meet, etc. WallCrete is only suitable for interior use.