Make hair curly w/karetine?

kay, i no keratine iz 2 make ur hair straight but i want my hair 2 b made curly w/keratine. I have straight hair but 4 me it looks better n curls and my sisters do keratine and it stays good 4 months. only problem is I heard if u put ur hair up or w/barrets ect 4 about 3days after you had the treatment ud have permant kinks and if i put it in curlers w/barrets 2 help keep it up right after instead of curling it... idk plz help and try 2 make sure ur right plz! my hair iz in ur hands!!!