This non-poisonous waterproof cementitious mortar comes with the elastic film that can surely protect against water leakage, cracking problems and hide imperfections on surfaces. It can be diluted with water and applied on exterior or interior areas such as outdoor water tanks and man-made ponds. With the 2-side application feature, it allows to use with either side of concrete or brick surfaces (the side that directly contacts with water and the one with no water contact).