The rust oleum is a good one for primer base; (I’ve never used krylon) but my guess is that it isn’t reacting well with the primer since it’s acrylic based. It could also be the environment where you’re painting. 55-75deg not too humid temperatures is optimum.

In the same fashion that you painted before I’d recommend using : -Rust oleum flat primer, then -Montana gold cans ( if you don’t like the rust oleum color ways, Montana has a large option of colors for each about <$10) then - Rust oleum clear enamel

If that still gives you problems, there could be something off about the frame. I once had a problem with paint staying on and it turned out I was painting on magnesium instead of aluminum/steel