Spray can and clear coat question

I wouldn't use clear coat in the engine bay and trunk. It is almost impossible to touch up clear coat well, and those areas get nicked easy. Rattle can paint has held up well in my engine bay. I like Rustoleum cans you can spray at any angle. It is all in the prep. Wire brush or sand blast to shiny metal or at least black, hard rust. I used Rust Destroyer primer which etches bare metal and converts rust, plus good to 800 F, but allow at least 1 week cure or risk wrinkling the top coat.