A method of treating hair comprising applying a hair building solid agent (30) for use on or with one or more of hair (10), skin and hair building solids (20) for altering and/or maintaining the electrostatic charge of the hair and/or skin such that it has a substantially negative polarity. The method further comprises applying hair building solids (20) to hair (10) before and/or during and/or after applying the hair building solid agent (30). The hair building solid agent (30) is applied as a spray on to the hair and/or skin and/or hair building solid.
