Well being a "beginner" with the HVLP painting, I was very satisfied with the Ironguard paint. As was noted, went on easy, and mine was dry to the touch in less than a half hour. And the shine was exceptional.
BUT my tractor sits in the living room, so likely it won't be fading.
As for the rattle can painting, which I will never do again seeing how easy painting actually is with a HLVP gun, and the Ironguard paint.
But my 100 I did five years ago or so with the Cub Cadet rattle cans still looks good, and that paint dried so fast you had a hard time getting the next coat on while it was still tacky. So I ended up doing less pieces at one time...
To the OP, you'll be fine painting over the Rustoleum primer. If you have concerns, just try it out on a couple smaller pieces and survey the situation and see what it looks like and go from there...
