Just another possible alternative base for some parts,,,,, I've very recently been using PPG breakthrough waterbourne commercial paint (from home & commercial, not car, paint stores) on residential & commercial doors & windows at my day job.
Been playing with a few samples. In proper conditions it dries hard enough to sand pretty quickly , responded well to a sloppy quick hand buffing, and seemed much happier under a coat of spi matt clear I sampled on it yesterday. It also stuck great straight onto smooth stainless steel barely scuffed with 400 grit, no primer. Try that with rust oleum & see what happens.
While I'm not really interested in trying automotive waterbourne paints ( you'd need to pry solvent car paints from my cold dead fingers ) , a few commercial waterbourne paints I've used at work last few years could be a better choice for an amateur car paint job at home, rather than this peel off plasti-dip crap or rolling on rust oleum like some goofballs in a car magazine article showed you or trying to heat & pull wrap over curved surfaces without enough experience. The two red colors I had to do recently were pretty vibrant, as people favoring waterbourne base colors claim, but without proper type of controlled environment , dry times of waterbourne just go to hell, unlike the spi clears I've sprayed when it's raining.