AAMA 2603, 2604, and 2605 are the three main voluntary specification standards for organic coatings on aluminum extrusions. They differ in how the coating performs over time. Specifically, how it holds color and gloss in the sun.
AAMA 2603 is the entry-level pipeline coating. It is fine for interior trim or non-exposed applications, but in direct sun it will chalk and fade noticeably within 5 years. We do not specify it for exterior windows or doors.
AAMA 2604 is the residential workhorse. It holds color for 5 to 10 years in Florida sun before noticeable fade. It is what most production homes ship with. The price premium over 2603 is small and the durability gain is large.
AAMA 2605 is the architectural standard. PVDF (Kynar) coating, 10-year warranty against fade and chalking, and the only finish we recommend for high-end residential or commercial work in coastal climates. It costs about 15 to 20 percent more than 2604, and on premium projects it is non-negotiable.
