Of course you can take this to any level you want, powder coating, spraying high quailty automotive paint from a paint gun or using quailty rattle can. I like the Duplicolor high temp engine paints as well, they go on nice and have a hard shell, I like to use the DC engine primer for a first coat, this make the color coat cover better, then in some cases I finish after the color coat with DC engine clear, if I want a part to be really shiney.
I'm not a big fan of Rustoleum, it's a slow drying, very soft paint, and I think it's not very durable, but each to thier own.