I'm late to this party, but because of curiosity and some knowledge of painting I searched for "rattle can" in this site.
Looks like this has sort of issue been visited before.
https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=856870&page=1 My point is, your fading probably occurred because of inferior products and it is going to do it again. And did you use a sealer over the last finish on the dash? I recommend buying a small touch up gun and learn to use it, it is easy. This way you can buy any paint you want, add anything into it you want (hardeners, flattening base, flexible additives, flakes, etc), get the quality you expect, and save your finger from lots of stress. The little gun does not take that much more effort. That said, I still plan on painting my lower dash with "Hammerite Black" because I want that finish and the stuff is tough.
I have plenty of rattle cans on the shelf and in boxes in my shop. But also many hind sight wishes I didn't do that come with it too. Sometimes I got lazy, sometimes went on the cheap, mostly its for very small jobs where absolute color or longevity does not matter.
Like CASO says, be happy. I say, get a paint gun.
Dave
