Scuff entire frame.
Wipe down with lacquer thinner to remove oil from hands and dust.
primer coat.
wetsand, fixing any flaws in primer.
primer coat again.
lightly wetsand again, and clean.
apply first coat of paint.
lightly wetsand any imperfections.
apply second coat of paint, and repeat.
apply one good coat of clear enamel.
You should wind up with a super smooth, super glossy finish product. The results are all dependent on the prep. work along the way. Take your time with it. Let it dry fully in between each step. You might not even need much primer, if you have a good base coat of existing paint. Just scuff it, until it is dulled a bit. You dont have to sand to the metal. Just take the top off.