Corrosion Resistant Pre-Engineered Steel Workshop A pre-engineered steel workshop built for sites where steel corrodes: coastlines, chemical plants, humid climates and livestock buildings. The frame is welded H-section steel in Q235 or Q355 carbon structural steel, blasted and coated to a stated film thickness before it leaves the workshop. Paint System – Why Film Thickness Matters "Painted" means nothing on its own. What decides how long a workshop lasts on a coastal or