Maaco uses Sherwin-Williams automotive paints, but the cheaper lines. They won’t do the prep. And TBH, SW makes underwhelming paint.
Better shops use PPG Deltron/Envirobase or Nexa Autocolor(which is British PPG) or the better Axalta lines(Cromax, Spies Hecker and Standox). PPG is to car paint as Benjamin Moore is to houses. But 99% of the time, it’s the prepper and painter. I know guys who can make the cheap line of PPG or Axalta go on like glass.