Wash the steel desk with a water-based degreasing cleanser, using a coarse sponge. Rinse the desk with wet rags and dry it with towels.
Set the desk on heavy-duty fabric dropcloths. Cover portions of the desk you do not want painted with painter's tape.
Coat the clean steel desk with galvanized metal etching primer, using a roller, equipped with a nap cover. Promote a professional-looking finish by smoothing the wet primer, using a paintbrush, engineered for use with latex paint. Apply light pressure and brush with long, vertical strokes. Wait four hours for the primed desk to dry.
Wash your painting tools with water.
Coat the primed steel desk with an oil-based enamel, using a roller, equipped with a shed-free cover. Promote a professional-looking finish by smoothing the wet enamel, using a paintbrush, engineered for use with oil-based paint. Apply light pressure and brush with long, vertical strokes. Wait six hours before using the desk.
Wash your painting tools with mineral spirits.