About the problems of the fixactive/protective products for wall paintings especially on the facades

The selection of protective coatings for painted facades is a delicate process, primarily due to the vast array of products available on the market. The chosen product must adhere to specific criteria: it should be easy to apply, maintain its protective qualities over the years without undergoing chromatic alterations (such as blackening or yellowing), and be reversible. Since the late 20th century, numerous studies have been conducted by the Istituto Centrale per il Restauro in Rome to ensure that protective agents can last for at least 15 years. The product Paraloid B72 (a copolymer of acrylate and methacrylate of methyl and ethyl) has produced very satisfactory results both aesthetically and mechanically, and its use was successfully confirmed in 1970 for the facades in Feltre. In 2000, under the Leader II project "Redevelopment of Urban Fronts in Feltre," a new analysis campaign by the scientific committee recommended the use of Rhodorsil (silane). However, the degradation of the wall paintings on those facades was severe, rendering them increasingly unreadable. After over 40 years of experience with external and internal wall paintings in the Veneto region, particularly in Feltre, restorations in Armenia were approached using the Samedi methodology.