Some will wilt a little, others will not. i had a couple wilt and shrivel and those died. make sure you get the clone into rooting compound asap after slicing 45. rooting compound makes a big difference with regard to root growth. i have found clean ph'd water in my bubble cloner to work the best. any time i added anything to resiviour root rot crept in. Make sure to change your H2O more frequently. I do mist with ST in the beginning for first couple days though. I have heard that clippin the tips help encourage root development. I have not tried that as of yet.
what system are you using? I also find that in my system i get faster root growth if i don't leave the clone receding below the water but rather let the bubbles and humidity attract the roots down to the water. I don't let the clone hang "in" the water is what i'm trying to type.
peace