, Boudreaux's Butt Paste has been trusted for over 40 years by pediatricians and parents to help protect irritated skin due to diaper rash and instantly seal out wetness. When used on a daily basis, it is also a great way to help prevent diaper rash. Boudreaux's Butt Paste Maximum Strength is a thick diaper rash paste that contains 40% zinc oxide?the maximum level of zinc oxide available over-the-counter. It is a clinically tested, safe and effective formula that relieves discomfort in one use, and provides long lasting overnight protection. Boudreaux's Butt Paste Maximum Strength contains no unwanted ingredients and is free from dyes, preservatives, parabens and talc.