Pureology Fullfyl Densifying Spray 4.2 oz. Pump up the volume with a hair thickening spray that penetrates the hair shaft and crystallizes to reinforce each strand. Densifying formulas plump up color-treated hair to its full potential, for the look and feel of thicker, fuller hair! PhytoBlend, a plant-derived protein wraps around each strand for a densifying effect. Fullfyl's signature aromatherapy blend of tropical fruit, white floral and vanilla create a luxurious experience, while our exclusive AntiFade Complex helps keep color vibrant and shiny.