maui island secret browning formula 8 oz. maui island secret promotes the fastest, darkest, most long-lasting tan with an amazing short time in any sun. pure and clean with no sticky residue! our secret browning formula is the ideal way to achieve a fast natural tan like the locals of maui with minimal exposure to the sun. this is not a dye, stain, or any type of skin colorant. rather, we use local natural ingredients to prepare maui island secret. the result is a browning formula that uses the power of the sun to achieve a safe, even tan that will last for weeks.