Epoxy or Urethane High Build... what's next for me?

I highly recommend spi epoxy, then 2k to block then base then spi clear. I haven't sprayed their clear yet but there epoxy is good stuff. They are responsibly priced and their tech guy is awesome he is always willing to help and will text with you and answer any questions you may have.
https://www.southernpolyurethanes.com