Well it looks great. I did a suburban frame like that in the past with an epoxy Primer. My only regret was that I didn't top coat it with anything.
I’ve done it in the past also, other epoxies tended to get chalky after a while so I always top coated after the first one.
SPI’s black epoxy has uv inhibitors in it. Supposedly if the mix is induced 4 hrs before spraying, it’s supposed to hold up well. We’ll see. I’m looking for a simple cost effective solution to frame coatings. Granted I used up the whole 1 gal setup, so 2 gal sprayable at $300ish.