Thanks - The paint I had planned to use is 2K PPG Delthane (single stage) urethane (AKA Delfleet), which uses an activator (AKA "hardner"). Its stupid expensive, so I'm open to suggestions (currently looking at Omni paint, which is PPG line also). Seems that single stage (ie, no clear coat needed) is getting hard to find...
Having said this, my experience with "Rustoleum" type paint, rattle can paint, and other single stage consumer paint has been poor, particularly for something that will be bathed in fuel and oil.
Looks like POR15 makes a prepackaged 2K product in "safety yellow" that might work...still expensive though; ~ $80 qt shipped USD. Getting hard for DIY'ers...