I roughed mine up with some wet n dry and sprayed them with normal cellulose primer and topcoat, they came up lovely. Peeps say it doesn't always last but they are so easy to take off and do again its not worth worrying about.
satin looks great on arches n lamp surrounds, gloss on metalwork, covers minor imperfections really well, touch dry in minutes and has an excellent finish
As part of my CSW refurb project I finished the wings the other day. I repainted the lamp surrounds with Halfords plastic bumper paint. It went on well, but only after Id found it did not like to go on cold. Much better at 18deg+.