Water based water-repellent based on an emulsion of silane/siloxane with good penetration properties. It is recommended for waterproofing of porous and non-cracked substrates on façades and other vertical surfaces, preventing water from penetrating and protecting against severe weather conditions. Its technology allows the vertical surfaces to be totally waterproofed, maintaining unaltered the breathability of the substrates and without changing its original appearance. It has a whitish tone which becomes invisible after drying.