People have criticised my buses roof for being dirty. I've often referred to it as "organic patina" that can offset my carbon foot print. It can't. That's balls. I have said it will catch on and I've had several buses in with. The starts of good OP but....... It doesn't get any better than this. And oh my. It's chrome yellow too. Like mine. So mark my words, organic patina is 2013's thing. And if anyone asks, you heard it here, first and it was started by Birdy (because he simply couldn't be bothered to clean his roof) shhhhh)
I think he's going for insulation from the solar heat of the summer OR Waiting for it to grow something he can eat while on the road. LOL