Resistance to artificial daylight of paints used in urban artworks. Influence of paint composition and substrate

Solar radiation is one of the deterioration factors par excellence modern urban artworks, as among other manifestations, it causes loss colour. This can compromise durability works, although not known to what extent this vary depending on substrate supporting paint. We evaluated susceptibility sunlight 10 paints differing compositions typically used by artists, exposing them, applied concrete and brick, artificial ageing test in laboratory conditions. Colour changes over time were studied, along with mineralogical (x-ray diffraction), chemical (scanning electron microscopy-energy dispersive x-ray spectroscopy) physical (contact angle peeling tests) changes. The these substrates depends mainly paint composition (base, pigment filler) but also type substrate, influences adhesion capacity. greatest colour modification was detected fluorescent paints, which lose due degradation organic phase, aggravation defects during drying, eventually detach from substrate.