This prepainted colour coated steel coil starts from a continuous hot dip galvanized substrate carrying a zinc coating mass adjustable between Z60 and Z275 g/m2, then receives a two coat two bake organic finish on a continuous painting line. Roofing producers running coastal warehouses, agricultural sheds and residential estate roofing normally specify the heavier end of the range, because every additional gram of zinc buys measurable service life before red rust appears at