Has anyone used a spray fake tan? If so which is the best (I'm quite fair skinned) and how often does it have to be applied?

Articles I've read about them lead me to think they're really easy to use - is this true? Doesn't the stuff go all over the place though? We've recently had our bathroom done and all the walls and shower cubicle are tiled white. I shudder to think what would happen if I stained all the grout a nice shade of brown (wouldn't be the most popular missus on the planet!!)