It may be a good candidate for spray painting.
Spray paint come in multiple finishes including satin and matte which may be a nice sheen for your furniture painting project. The Rustoleum spray paints get my highest recommendation.
Have a look at the — Universal line has a wonderful applicator spray tip - that can offer effortless and professional results.
Only use oil based paints or rust preventative spray paint.
Where is the metal, and what is the object being used for?
My favorite metal spray is now Rustoleum 2X. Good for metal, plastic, and wood, this comes in many coordinating colors and looks so smooth and shiny. Jewell
Annie Sloan chalk paint sticks great to metal. Also Modern Masters has a line made for metal. :)
You could use spray paint that is suitable for metal