I haven't ever found a metallic spray paint that has ever felt convincing. I'm sure they're out there, and there are ways to achieve a good finish, but I avoid them. I've used Rustoleum Enamel spray paint on some vintage Billy Curry-designed Laurel Lamps. Cast aluminum base with a metal tube stem. I used some metal-primer I didn't particularly like (very runny, I forget its name), but the enamel went on well. I think I sanded lightly between coats and got very smooth coverage. I never clear coated. I should probably get on that. I still have one left to do.