Being a painter for over 35 years in both liquid and powder. 2k acrylic enamel would be your best bet. powder gets chipped or scratched hard to match up and can be brittle on edges. Only way to remove is steel shot blast or burn off oven which will warp frame. Liquid can be touched up and blended very nicely and it's durable and don't flake with age if in humid areas. And can be sanded or stripped if needed in future. It is also closest to original paint.