All I can say is this guys, I've worked with rattle cans since the early 70's. The products out today are superior even to those lead based rattlers of yesteryear. I myself have painted K-members, shocks, rear ends, under chassis and small parts with Epoxy based rattlers or good old Rust-oLeum and others.

Like any paint job, prep and cleanness, application and flash dry times, and a reasonable amount of light coats and sanding in between and a top clear coat makes for a beautiful product. Do they hold up to chemicals, most do if applied correctly.
Chip wise, epoxy baked products have been durable, but still may chip on an occasion. Trust me when I say that.
The secret to painting most small items with spray paint is the type of cap that is used. Some caps can spray almost as wide as some spray guns and that makes for an even steven coat.
Keep your distance and apply a few light coats in between, that will get you there. Good luck.