No matter which metal you're painting, spray painting might be an option.
If the object is able to be moved so overspray doesn't damage nearby items, consider spraying for convenience and the ability to apply a thinner coating.
To properly spray metal:
- Ensure the surface is clean and dry. Remove any dirt, grease, etc.
- Cover nearby area to protect from spray mist.
- Prime bare metal with an anti-rust primer to enhance corrosion resistance. This will also give the paint a better surface to adhere to. Use short, dusting strokes to cover substrate. Allow an hour* to dry before topcoating.
- Top coat with a multipurpose enamel or anti-rust enamel. Move can back and forth, releasing button after each stroke. Overlap each stroke. It is better to apply several thin coats than one heavy coat, which may cause runs or drips. Shake can frequently during use to ensure paint stays mixed.
*Drying times may vary. Check directions on back of can.