I'll let you know in a year. I did this in May 2008. It is fading but I have not taken any care to preserve it. It is my camping, hunting and general beater truck.
Here is an example of the use it gets.
My thought is that any paint will fade and deteriorate with age if not cared for.

1953 Chevrolet 3600
Fried Green T'mater (Vern)
In the Stovebolt Gallery
Caution: Political Statement
Man who runs in front of car gets tired, man who runs behind car gets exhausted.