O.R.A Anti-rain transparent liquid waterproofing, easy and quick to apply, it stops water infiltration on balconies or terraces already tiled, without removing the existing tiles or floor.  The Do-it-yourself product, easy to apply by roll or brush, it does not alter the aspect of the tile.  Usable both during summer and winter time, it is applicable to any kind of floorings, over stone or "Cotto" surfaces.