In the aluminum window and door industry, surface treatment is not merely cosmetic—it defines service life. Powder coating remains the most widely used option thanks to its cost-effectiveness and color flexibility, but its resistance to UV degradation varies significantly by resin quality and curing control. Anodizing delivers superior hardness and a metallic texture that architects love, yet its thin oxide layer struggles in coastal environments unless sealed properly. For projects near the sea, PVDF fluorocarbon coating is the gold standard—its 20+ year color retention outperforms polyester-based systems by a wide margin. Electrophoresis offers a smooth, semi-transparent finish that resists corrosion well, but the process demands impeccable pre-treatment; any contamination will telegraph through the film. After two decades on the shop floor, my rule is simple: match the finish to the environment, not the budget. A cheap coating on a seaside balcony is the most expensive mistake you can make.
