Tiber was neutered at about 6.5 months and i've never had a problem with him spraying. but he's still a goofy kitten. some of his old habits have dissapeared, (he doesnt feel the need to be so clingy at night all the time with the purring massages... he used to do it at least 4 times a night, now he does it maybe once a week, dont get me wrong i love the love he's giveing me, but eeesh all night long! oh and he doesnt attack my toes in bed as much any more) and he's picked up some new ones. Like now we play tag back and forth down the hall, (we chase each other's feet). But i dont think that had anything to do with neutering, just him growing up.