The NZ Metal Roof and Wall Cladding Code of Practice is a comprehensive design & installation guide, and a recognised related document for Acceptable Solution E2/AS1 of the NZ Building Code.
New Zealand has a harsh level of ultraviolet light. Paint formulations that are successful overseas have sometimes been found wanting in colour fastness in the Australasian environment. Proprietary pre-painted cladding products should give durability protection and keep its appearance for at least 15 years, and at the end of that period still have the anti-corrosive primers intact and present a good substrate for over-painting.
The performance of all paint coatings, however, can be affected by avoidable outside influences.