This Standard is based on specifications and requirements which intend to provide a target useful coating life of 15 years, which is considered to be the time period, from initial application, over which the coating system is intended to remain in “GOOD” condition. The actual useful life will vary, depending on numerous variables including actual conditions encountered in service. 从这句话里可以看出,PSPC的目标是希望做到15年,从配套到对油漆的要求,在到施工,现实中有很多变量,谁都说不准,但是对于油漆公司来说他们有很多保护自己的方法,具体我也不列出了,因为只要干过技术服务都知道怎么做。呵呵!