Shut off the power running to the wires within the galvanized EMT conduit.
Scrub away the oily coating using a water-based degreaser and a coarse brush.
Rinse the conduit with a damp rag, and allow the surface to dry out completely before continuing.
Apply a light coat of etching primer to conduit, effectively abrading it to promote paint adhesion.
Allow the etching primer to cure for four hours, and then apply a coat of spray acrylic latex paint. Do not apply in a steady, constant stream. Apply in brief, intermittent bursts to encourage a smooth finish free of runs.