- Transform frizzy, curly or unruly hair and tame it into smooth, straight, obedient style with this light, greaseless styling lotion. RUSK® Str8™ Anti-Frizz and Anti-Curl Lotion temporarily removes curl, eliminates frizz, blocks humidity for up to 24 hours and becomes invisible in the hair. Temporarily removes curl and eliminates frizz. Blocks humidity for up to 24 hours. Becomes invisible in the hair. Apply a dime-size amount to freshly washed, towel-dried hair. Distribute evenly throughout the hair. Style as desired.