Pre-Painted Steel Definition The base metal of pre-painted steel are galvanizing steel, galvalume steel and cold rolled steel smooth and fine painted surface, selection of colors and material properties that meet specific needs through the combined use of diverse paints and base substrates. Improved such factors as process, space, energy and load savings at user plant. Thickness:0.15--1.0mm Width:600--1250mm zinc coating:20-100gsm Top Paint coating:10--20um Back Paint coating:4-8um.