for osis mess up, if i am not mistaken if you use it together with osis 4-play moulding cream + osis freeze fix strong hold spray < tats what i see from some site ^^'' your style will last longer...

i havent try any schwarzkopf n osis product yet >.<'' but i gonna change to them after i fin my shampoo n loreal clay ^^ from wat i heard schwarzkopf is a great brand in hair product ^^

act to hold hair it depends a bit on ur hair >.< i've got some fren that their hair kinda hard to hold up the style, even the stylist told them tat...
but normally if you want ur hair to hold up a style for a long period den spray is a recommended after u use ur wax/clay

and also if u never get ur haircut, its hard to style up >.< wax/clay is not a magic and tats y there are salon around ^^

agree on that haha i normally just use those spray if i going for special event or if i am going out more than half day
normally when go out i'll just use clay and when go class seldom style ~.~