I used Jet Flex over Akzo Nobel primer. It sprayed very easily, and result was excellent, especially for a novice painter. Had to buy a gallon, with reducer and catalyst.
Color is Blue Black, semi-gloss (L09027). One gallon, 2 quarts of reducer, and 1 pt. of catalyst ran me $311 from Alliance Coatings in El Cajon. Very quick delivery. Not sure how that compares, but the help and service was excellent.
Have a LOT remaining. Still have things to paint, but will use way less than half of what I have. Willing to part with half if anyone interested in dark grey. (Blue Black is not very accurate, I really can't detect any blue. Just a dark grey).
Good luck with your painting project.
West Covina, CA
QB Fuselage and wings in hand
Taking a bite of the elephant every day.