You are partly right... but dont think you can put nason for dupont or a cheaper line of some of these paints and its going to hold up the same... You will see the difference over time. I have a 1950 gmc that was my first ride, that when I was 15 took the advise of my teacher and used top of the line dupont primers and paints...It has been 15 years and kept in the garage about half the time... It can be waxed or polished and nearly looks as good as the day I painted it. Have done jobs with cheaper stuff and they look great for a while but not the long haul... I have seen some sharp krylon jobs on here but you just want and some paint guy is going to charge you double one day to get all that off... Prep is everything, You could get the best paint produced and put it over crap paint or rust and it will just last a little longer than the rest... Do it right and it will last a life time.