figured I had to try www.paintforcars.com "Trinity" brand urethane @ ~$79 gallon including hardener and reducer. The ad did say it was comparable to Imron but had an 85 gloss.
I didn't understand at the time because when I had used Imron it had at least 94-100+ gloss.

Unfortunately it really has an 85 gloss as advertised, even with hardener supplied. Maybe I could topcoat with some old leftover clear Imron and hopefully it will adhere.