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Powdercoating / spray painting - small job

Hi, I would like to paint some steel trays and covers. They are to be used in a high humidity environment. Trays are made from mild steel, covers are galvanised with an epoxyed ali angle on the back. They roughly measure 900 x 120 x 30mm I would prefer if as close colour to resene back white as possible, in a flat/matte finish.