Water-based acrylic-siloxanic paint for outdoor use, studied and formulated to give the painting skills as a high resistance to the combined action of atmospheric and solar radiations as well as the chemical aggression of pollutants. It presents qualities of high water repellency and at the same time a high vapor permeability, protecting the surface from the disruptive action of the water while maintaining breathability. The progressive interaction between the siloxanic coating and the stone or masonry support helps to strengthen the adhesion over time ensuring exceptional durability. Recommended for the protection of new facilities and the restoration of old buildings.