My hairdresser began using Malibu C products and for the past few years has always prepped my hair before highlighting with the Malibu C Color Prepare. My highlights last forever now! No brassiness at all, ever. No more of that "yellow" look, either. Just natural blonde highlights, gorgeous. And they last much longer because I use the Blonde treatment at home - makes a huge different in between highlights. I can wait much longer in between expensive salon services now. Love this stuff.