Fast drying flexible liquid membrane for interior waterproofing. Applications: Liquid waterproofing membrane for interior surfaces provided they are not continually immersed in water or subject to rising damp. Mapegum WPS can be used on all types of substrates such as: gypsum board walls, gypsum and cementitious renders, light-weight concrete blocks, wood, existing ceramic tiles, cementitious and anhydrite substrates, wood substrates, magnesite, hot poured asphalt. Waterproofer for bathroom and shower walls and floors before installing ceramic tiles and natural stone; waterproofing kitchen floors and walls and counter tops before installing ceramic tiles. N.B.: Mapegum WPS has been certified by the following institutes as a waterproofing membrane for damp environments, to be applied underneath tiled surfaces.