Reply to "Gold, brown, beige..?"

A question on paint, are there some pro painters out there? I'm thinking about painting my Pantera yellow. But not just yellow, the hi-glow, hi-light yellow that some fire trucks have. I've earlier painted my street/strip Camaro that colour, first white, then the special and expensive yellow, then clear coat.

When it just rolled out of the paint booth it was amazing. It was almost glowing in the dark, and if you drove it early in the morning with some sun on it dew on the hood, you couldn't see anything. That year my car was featured in magazines at car shows, because of the colour alone "bright as the sun" they wrote.

Now to the question. It lasted about 1½ year, then the yellow faded to white on the fenders. And I've also noticed that some mopeds that have a similar orange paint here in Denmark, they tend to fade very fast. Is that avoidable? Or are these colours just too sensitive to the sun?

(The picture doesn't do the color justice)