Hi
DON'T SELL THE LANDY
I suppose it depends on what you're advertising, as it's quite a big thing over here, vinyl wrapping, with your company splurged all over your car, and they're pretty hideous on the whole, but I did see one parked next to us t'other day at the cash'n'carry advertising a hunting supplies shop...eye-catching and well executed with some fine detailing...but they fade and look awful in a year or two.
Paint is the only way to go...and, believe it or not, paint has been used on cars for over a century with minimal problems

Lots of effects, lots of colours, and shines up like a demon.
You can get a cheapish spray job using coach enamels, and I always did my Landys in that paint....don't know what it is about it, but once painted, I never washed them , and they never seemed to have the dirt stick that well....a good downpour often worked well as a car-wash!
Cheers
Helen
In the beginning there was nothing , then God said "Let there be Light".....There was still nothing , but ,by crikey, you could see it better.