Small parts that are subject to wear and tear can be powder coated.

I have also bought good car paint and painted small parts with a Preval sprayer from the hardware store. You wouldn't want to paint large sheetmetal parts with it, but for brackets and such it can look just as good as anything else if you get the reducer amount dialed in.

The Pro Grade Rustoleum paints in the tall silver cans are the best rattle can paint I have used. Very thick and glossy vs the others.