Multi-layer steel starts with heavy-gauge carbon steel (11-14 ga) pre-treated with phosphate conversion coating, then electrostatically applied polyester powder baked at 400°F. The multi-layer polymer build (primer + color + clear coat) creates 4-6 mil thickness preventing moisture penetration while flexing with metal thermal expansion.
This construction dominates commercial smoker cabinets, grill carts, and pellet hopper bodies resisting grease splatter, UV fading, and 10+ year outdoor exposure without chalking or peeling.