mike i like single stage to.I have painted for over 25 years and one thing i can tell you is. i have do not think much on the durable per dollar think enamel still work. i have sprayed the acrylic urethane and polyurethane to all work. it come down to price and work time and if you sand and wheel the it the enamel work good so dose the acrylic urethane my 50 is single stage black 17 years old acrylic urethane and the paint was great stuff dau ppg but they stop making it if i repaint it it will go enamel the new stuff is way to much money . the last job i did for a customer it was $400 for paint and clear just to spray the fender on a55 chevy truck it done in ppg dau . i hand to use the new ppg stuff work good sanded wheel great . just to much money for me