They are inert, and do not degrade over time. 3.2 Paint Only use factory applied paint. Polyester resin finishes offer least durability. Fading will occur in 5 to 7 years. Twenty year warranties are available.
Fluorpolymer resins provide a state of the art finish.
Five paint companies produce this paint under the brand names of Duranar, Nubelar, Fluropon, Trinar, and Visulure. Bare aluminized or Galvalume panel can last 40 years without maintenance and is a better choice than polyester resin finishes. 3.3 Panel thermal movement Metal panels respond to temperature change by expanding and contracting. This causes the fastener hole size to increase, resulting in leaks. Dark colors will experience the largest thermal movement.