The only spray that looks reasonable is jet-black (and it still makes hair very stiff and rubs off, though I've had success with it since my hair is short - some of the other dark colors I'm told will work if you have lighter hair, but personally with my dark-brown hair it ends up looking, at best, really weird...)
If you insist on using a "temporary dye" instead of a wig, there are other options out there, Mehron makes some "liquid makeup/hair color" that is supposed to be good, and for some small streaks I've had mixed success using regular pancake makeup (kryolan aquacolor and Wolfe) I've seen people who have used the aquacolor and it looks very good but I dont know exactly how they did it...
As for a wig, if you braid your hair first then wrap it tightly and use a wigcap it should work fine. Not dont this myself since my hair is short, but I've seen LOTS of people use this technique and it works (no idea how/if it tangles afterwards though, that's not usually mentioned)
'Bring peace to the lost lamb, grant rest to the fangs of the wolf, and deliver the Hammer of God unto the Devil', - Sister Rosette Christopher, Chrno Crusade
"The bad news is he ended up building the whole rock tower... the good news *gulp* I have a rock tower to knock down..." - Rainbow Dash, My Little Pony: Fiendship is Magic (S03E09)