help and options highly needed on single stage

nason that it knew i was spelling it wrong. I'm going to primer sealer the car piece by piece my body guy that does tons of hot rods around here did the work on my valiant he told me to primer seal piece by piece then sand when I'm ready to paint the single stage and get nason cus its user friendly and he says it sprays great and wet sand buff and the guys at DuPont said with the nason single stage it will last for years they said it would last maybe 12-16yrs if i wax it monthly and everything.