I had a 79 Malibu that i did all the bodywork and brought it to a MACO in Farmingdale and they painted it. It looked decent for about a year then the paint started to get really dull. It wouldn't even buff out to a shine anymore. But for $299 at the time i couldn't complain.
On the other hand when i did my 68 i used all the best products and it was immaculate and i drove it quite a bit and raced it quite a bit. It actually got damaged in my garage when i dropped stuff on it and banged into it.
One day ill fix it but its not the end of the world.
Just do whatever makes you happy and drive it, you only live once on this stinking rock.