Pete! did you plasti dip your landy? I was just going to start a thread about plast dip and saw your thread! There are a few option apart from plasti dip! Ive seen a few places in the uk selling dip but called liquid dip, its exactly the same same stuff but cheaper. Loads of vids on youtube about it and they pressure wash it. Not sure how durable it would be green laneing but should hold up well i think. The bonus is it peels off when yor fed up of the colour! It used to be matt colours but now you get metalics, pearl, and gloss.
I have a earlex 5500 airless sprayer which i must say is fatastic at spraying anything, it has a 2.0 needle but i think you would need a 0.8 -1.0 to get good atomisation!
As a test i started doing my alloy wheels yesterday, i have done one so far as its been bloody foggy over here so i had to take wheel off to do in garage! I used the spray cans (1 can per wheel) 6 coats, 15 mins between coats! I must say i think it looks great but will be avoiding all curbs! I'll post some pics of the process if anyone is interested.