New - Ouai Hair Gloss In-Shower Shine Treatment 177 mL What it is: An in-shower hair gloss with hyaluronic acid and rice water to boost shine, protect color, reduce frizz, and take hair strength up a notch. After shampooing, separate your hair into sections and apply a pea-size amount from mid-lengths to ends. Comb through hair for root application. After waiting 5 minutes, rinse out. You can use this treatment with or without conditioner and it delivers best results with heat. Last up to three washes.