True. Being around experienced body shop guys, learned a good deal from them on how to find defects. Lol, when prepping my truck, the owner would come by to inspect my work. He’d say “See that indent there?” “Sorry Al, not seeing it.” “Well, ya won’t where your standing, stoop down and move over there to look”. Very inconspicuous but yep, there it was. In his shop was a ’67 GTO that looked nice at first, then he started pointing out one defect then a bunch more “See, here, here, and over there? Was a crap job the poor guy had done on it and he paid over 10 grand for this work 3 years ago.” As he pointed it out it became obvious.
A TON of patience and desire to prep right. Crap prep will not be hidden well with a nice paint job.