What types of lacquers are used for pianos high polished finishes?

All the polished surfaces of Petrof pianos are coated with polyester lacquers, black as well as white or transparent. Coating suppliers for many years systematically cooperate with Petrof factory. New coatings Used are more elastic to minimize the risk of surface cracks with temperature and humidity loading. Also the adhesion of lacquers to wooden surfaces is improving. Nevertheless it still holds generally that pianos must be protected against direct solar radiation (UV).